# Add slinky design to untanglable section _Exported on 9/25/2025 at 03:56:09 EDT from Cursor (1.5.11)_ --- **User** lets add my first slinky design to untanglable slinky section the image is in week3/individualassignment/slinky/slinky1.png add a caption and short description put a link to this youtube video @https://www.youtube.com/watch?v=hmdMsCs_Oz0 put a link to this magic slinky @https://www.printables.com/model/510147-slinky-magic-spring/files and explain what is available on @https://hackaday.io/project/20198-3d-printed-magic-spring say design files available and add a link to download all the files in week3/designfiles/slinky1 --- **Cursor** I'll help you add your first slinky design to the untanglable slinky section. Let me first examine the current week3.html file to understand the structure and then add the content you requested. Now I need to find the untanglable slinky section and add your first slinky design. I can see the section starts around line 401. Let me add the content you requested to that section. ```html

Untanglable Slinky

A complex 3D printable design that demonstrates additive manufacturing capabilities through intricate geometry that cannot be manufactured subtractively.

First Slinky Design

My initial exploration into creating a 3D printable slinky design, inspired by the classic magic spring concept.

First slinky design - initial exploration

First slinky design - exploring the magic spring concept

Design Description: This first slinky design represents my initial exploration into creating a 3D printable magic spring. The design focuses on creating a helical structure that can collapse and expand while maintaining its structural integrity.

This design was inspired by the classic slinky toy and the concept of creating a "magic spring" that can be 3D printed in one piece, demonstrating the unique capabilities of additive manufacturing.

Inspiration & Resources

This design draws inspiration from several sources and builds upon existing work in 3D printable magic springs:

Video Demonstration

Watch the slinky in action: YouTube Video - Magic Spring Demonstration

3D Printable Magic Spring

Download the original design: Printables - Slinky Magic Spring

Hackaday Project

Explore the technical details: Hackaday - 3D Printed Magic Spring

The Hackaday project provides comprehensive documentation including Java code for generating G-code, print parameters, and detailed instructions for creating 3D printable magic springs. The project includes multiple iterations of the code with different features like temperature control, spiral priming, and delta printer compatibility.

Design Files

All design files for this slinky project are available for download:

Download Design Files: week3/designfiles/slinky1/

This directory contains all the design files including STL files, CAD source files, and any additional documentation for the slinky project.

``` Let me try a more targeted approach by finding the exact text and replacing it: ```html Week 3 · HTMAA 2025 · 3D Scanning and Printing
Profile Image

Week 3

3D Scanning and Printing

Week Highlights

Exploring the capabilities and limitations of additive manufacturing through hands-on design and printing experiments.

Table of Contents

3D Scanning and Printing

This week focuses on additive manufacturing processes and 3D scanning technologies. We'll explore the differences between subtractive and additive processes, learn about various 3D printing materials and techniques, and understand the design constraints and capabilities of 3D printing systems.

Key Concepts: Additive vs subtractive manufacturing, design for 3D printing, material properties, scanning technologies

This Week's Goals

  • Test 3D printer design rules
    Group assignment: Test design rules for available 3D printer(s)
  • Design additive-only object
    Individual: Design and print object that cannot be made subtractively
  • 3D scan an object
    Individual: Scan an object and optionally print it

Assignments

  • Group Assignment
    Test design rules for 3D printer(s)
  • Individual Assignment
    Design, document, and 3D print object that could not be made subtractively
  • 3D Scanning
    3D scan an object (and optionally print it)

Tools & Materials

  • 3D Printers
    FDM, SLA, SLS systems
  • Materials
    PLA, PETG, ABS, specialty materials
  • Scanning Equipment
    Photogrammetry, structured light, laser scanning
  • Software
    Slicers, mesh editing, scanning software

3D Printing Processes

Understanding different additive manufacturing technologies and their applications.

Fused Deposition Modeling (FDM/FFF)

Most common desktop 3D printing method using thermoplastic filament

Stereolithography (SLA)

UV-cured resin printing for high detail and smooth surfaces

Selective Laser Sintering (SLS)

Powder-based printing for complex geometries without supports

Digital Light Processing (DLP)

Similar to SLA but uses digital light projection for faster printing

Binder Jetting

Powder and binder system for full-color printing

Material Jetting

Inkjet-style printing with multiple materials and colors

Materials

Common 3D printing materials and their properties.

PLA (Polylactic Acid)

Plant-based, biodegradable, easy to print, glass transition ~60°C, more brittle

PETG (Polyethylene Terephthalate Glycol)

Oil-based recyclable, glass transition ~80°C, tougher, better UV resistance

ABS (Acrylonitrile Butadiene Styrene)

Strong, impact-resistant, requires heated bed, more difficult to print

TPU (Thermoplastic Polyurethane)

Flexible material for rubber-like properties

PVA (Polyvinyl Alcohol)

Water-soluble support material

Specialty Materials

Wood-filled, metal-filled, carbon fiber, conductive materials

Design Rules for 3D Printing

Key constraints and guidelines for designing printable objects.

Overhangs & Supports

  • Overhang angle
    Typically 45° maximum without supports
  • Bridging
    Short spans can be printed without supports
  • Support types
    Tree, linear, and custom support structures

Geometry Constraints

  • Wall thickness
    Minimum thickness depends on nozzle size
  • Clearance
    Gaps between moving parts need proper spacing
  • Infill patterns
    Affects strength, weight, and print time

3D Scanning Methods

Various technologies for capturing 3D geometry of physical objects.

Photogrammetry

Multiple photos from different angles, processed with software like Meshroom, Polycam

Structured Light

Projects patterns onto object, captures deformation for 3D reconstruction

Laser Scanning

Time-of-flight or triangulation-based distance measurement

Stereo Vision

Two cameras for depth perception, similar to human vision

CT Scanning

X-ray tomography for internal structures and complex geometries

LIDAR

Light detection and ranging for large-scale scanning

File Formats

Common file formats used in 3D printing and scanning workflows.

3D Model Formats

  • STL
    Most common for 3D printing, triangular mesh
  • OBJ
    Includes texture and color information
  • 3MF
    Modern format with metadata and multiple objects
  • STEP
    CAD exchange format with precise geometry

Printing Formats

  • G-code
    Machine instructions for 3D printer
  • PLY
    Point cloud format for scanning
  • AMF
    Additive Manufacturing Format with materials
  • VRML/X3D
    Web-based 3D formats

Group Assignment: Test Design Rules

Test the design rules for your 3D printer(s) by creating a comprehensive test print that evaluates various design constraints and capabilities.

Test Categories

Design Test Files

Comprehensive STL files for testing various 3D printing design rules and constraints:

Individual Assignment: Additive-Only Design

Design, document, and 3D print an object that could not be made subtractively. The object should be small (few cm³) and limited by printer time.

Design Requirements

3D Scanning Component

Handgripper for Locomotive Age Assessment

I hope to design and fabricate a handgripper to measure age based on hand grip strength. This builds on our aging biomarker research by focusing on locomotive age assessment.

The idea is to measure functional decline due to aging across multiple modalities:

  • Cognition: Memory, attention, reasoning, and problem-solving
  • Locomotion: Mobility, balance, and muscle strength
  • Sensory: Vision, hearing, and touch
  • Vitality: Energy levels, nutrition, and sleep
  • Psychological: Emotional well-being, resilience, and social connections

Last week we measured cognition with reaction time - this week we focus on locomotive age through grip strength.

Proposed 3D Printable Components

Untanglable Slinky

Complex interlocking geometry that cannot be manufactured subtractively. Tests printer's ability to create intricate, self-supporting structures with minimal overhangs.

Single Torsion Spring

Helical spring mechanism for grip force measurement. Demonstrates additive manufacturing's capability to create functional mechanical components in one piece.

Double Torsion Spring

Nested spring system with different spring constants. Tests printer's ability to create complex, multi-component mechanisms with varying material properties.

Coil Mechanism

Spiral coil for force transmission and measurement. Explores the limits of printable coil geometries and their mechanical properties for sensor integration.

Untanglable Slinky

A complex 3D printable design that demonstrates additive manufacturing capabilities through intricate geometry that cannot be manufactured subtractively.

First Slinky Design

My initial exploration into creating a 3D printable slinky design, inspired by the classic magic spring concept.

First slinky design - initial exploration

First slinky design - exploring the magic spring concept

Design Description: This first slinky design represents my initial exploration into creating a 3D printable magic spring. The design focuses on creating a helical structure that can collapse and expand while maintaining its structural integrity.

This design was inspired by the classic slinky toy and the concept of creating a "magic spring" that can be 3D printed in one piece, demonstrating the unique capabilities of additive manufacturing.

Inspiration & Resources

This design draws inspiration from several sources and builds upon existing work in 3D printable magic springs:

Video Demonstration

Watch the slinky in action: YouTube Video - Magic Spring Demonstration

3D Printable Magic Spring

Download the original design: Printables - Slinky Magic Spring

Hackaday Project

Explore the technical details: Hackaday - 3D Printed Magic Spring

The Hackaday project provides comprehensive documentation including Java code for generating G-code, print parameters, and detailed instructions for creating 3D printable magic springs. The project includes multiple iterations of the code with different features like temperature control, spiral priming, and delta printer compatibility.

Design Files

All design files for this slinky project are available for download:

Download Design Files: week3/designfiles/slinky1/

This directory contains all the design files including STL files, CAD source files, and any additional documentation for the slinky project.

Human-AI Co-Design

This design was co-developed through iterative discussion with ChatGPT, exploring various approaches to create an untanglable slinky geometry.

Design Iterations

The design process involved multiple iterations, with the first two attempts resulting in tangled slinkies that failed to maintain proper coil separation:

Final Successful Design

The third iteration successfully achieved the desired untanglable geometry:

Final untanglable slinky design

Final design: Untanglable slinky with proper coil geometry

Design Description: This design shows an untanglable slinky with flat, oval coils, tiny spacers between turns, and solid end caps, so it collapses neatly without knots. The geometry enforces orderly stacking while preventing coils from slipping past each other.

This design was co-created through iterative discussion with ChatGPT, demonstrating effective human-AI collaboration in 3D design. View the full conversation transcript in the Ethical AI Use section →

Design Files

Links to CAD files, STL files, and other design assets for this week's assignments.

Group Assignment - 3D Printing Design Rules Test Files

Comprehensive STL files for testing various 3D printing design rules and constraints:

angle.stl

Tests overhang angles from 0° to 60°

📥 Download

anisotropy.stl

Evaluates directional strength properties

📥 Download

bridging.stl

Tests unsupported bridge capabilities

📥 Download

clearance.stl

Tests minimum clearance between parts

📥 Download

dimension.stl

Validates dimensional accuracy

📥 Download

finish.stl

Tests surface finish quality

📥 Download

free.stl

Tests unsupported geometry

📥 Download

infill.stl

Tests different infill patterns

📥 Download

overhang.stl

Tests overhang capabilities

📥 Download

thickness.stl

Tests minimum wall thickness

📥 Download

Reflections & Learnings

Key insights and lessons learned from working with 3D printing and scanning technologies.

Reflections will be added as work progresses

Contributions

Acknowledgements and team roles for this week's work.

Contributions will be documented as work progresses

Ethical AI Use

Documentation of AI tool usage for this week's assignments and design work.

Week 3 - 3D Scanning and Printing Development

View HTML Transcript Download Markdown

This session covers the development of the Week 3 page for 3D scanning and printing, including content population from MIT Academy resources, navigation updates, and design file integration.

Key Activities

  • Week 3 page creation from template
  • Content population from MIT Academy
  • Navigation button integration
  • Design file organization

AI Tools Used

  • Cursor AI for code generation
  • Content structuring and formatting
  • File organization and linking
  • Design consistency maintenance

Untanglable Slinky Co-Design Session

View HTML Transcript Download Markdown

This session documents the iterative co-design process for creating an untanglable slinky using ChatGPT. The conversation shows multiple design iterations, from initial failed attempts to the final successful geometry.

Design Process

  • Initial geometry exploration
  • Iterative refinement process
  • Problem-solving for tangling issues
  • Final successful design

AI Collaboration

  • ChatGPT for geometry suggestions
  • Iterative feedback and refinement
  • Problem diagnosis and solutions
  • Design validation and testing

Responsive Design Repository Refactoring

View ChatGPT Prompt View Cursor Transcript Download Markdown

This session documents the comprehensive refactoring of the entire web development repository to make it fully responsive and mobile-friendly. The conversation covers the implementation of modern CSS techniques, responsive design patterns, and mobile-first development approaches.

Key Activities

  • Responsive CSS framework creation
  • Mobile-first design implementation
  • Video container optimization
  • Typography and spacing refactoring

AI Collaboration

  • Cursor AI for responsive design
  • CSS framework architecture
  • Mobile optimization strategies
  • Cross-browser compatibility
``` Perfect! I've successfully added your first slinky design to the untanglable slinky section. Here's what I added: ## Summary of Changes I've added a comprehensive new section to your Week 3 HTML file that includes: ### 1. **First Slinky Design Section** - Added your image from `week3/individualassignment/slinky/slinky1.png` - Included a descriptive caption: "First slinky design - exploring the magic spring concept" - Added a short description explaining it's your initial exploration into 3D printable slinky design ### 2. **Inspiration & Resources Section** - **YouTube Video Link**: Added link to https://www.youtube.com/watch?v=hmdMsCs_Oz0 with description "YouTube Video - Magic Spring Demonstration" - **Printables Link**: Added link to https://www.printables.com/model/510147-slinky-magic-spring/files with description "Printables - Slinky Magic Spring" - **Hackaday Project Link**: Added link to https://hackaday.io/project/20198-3d-printed-magic-spring with detailed explanation of what's available there ### 3. **Design Files Section** - Added a link to download all files from `week3/designfiles/slinky1/` - Included description of what the directory contains (STL files, CAD source files, documentation) ### 4. **Content Structure** - Used consistent styling with the rest of your website - Added proper headings, descriptions, and visual elements - Included informative callout boxes with design descriptions - Made all external links open in new tabs The new content is now integrated into your existing untanglable slinky section and provides a comprehensive overview of your first slinky design along with all the resources and inspiration you requested. The styling matches your existing design system and maintains the professional look of your documentation. --- **User** put it under the human-AI co-design section --- **Cursor** I'll move the first slinky design section to be placed under the Human-AI Co-Design section instead of before it. ```html

A complex 3D printable design that demonstrates additive manufacturing capabilities through intricate geometry that cannot be manufactured subtractively.

Human-AI Co-Design

``` Let me read the current file to see the exact structure and then make the move: I can see the current structure. I need to move the "First Slinky Design" section (lines 409-460) to be placed after the "Human-AI Co-Design" section. Let me do this in two steps: 1. First, remove the First Slinky Design section from its current location 2. Then add it after the Human-AI Co-Design section ```html

A complex 3D printable design that demonstrates additive manufacturing capabilities through intricate geometry that cannot be manufactured subtractively.

Human-AI Co-Design

``` Let me try a different approach by using MultiEdit to make the changes: I can see the file has been modified and now uses different CSS classes. Let me read the current state and then make the move: Now I'll add the First Slinky Design section after the Human-AI Co-Design section ends (after line 498): ```html Week 3 · HTMAA 2025 · 3D Scanning and Printing
Profile Image

Week 3

3D Scanning and Printing

Week Highlights

Exploring the capabilities and limitations of additive manufacturing through hands-on design and printing experiments.

Table of Contents

3D Scanning and Printing

This week focuses on additive manufacturing processes and 3D scanning technologies. We'll explore the differences between subtractive and additive processes, learn about various 3D printing materials and techniques, and understand the design constraints and capabilities of 3D printing systems.

Key Concepts: Additive vs subtractive manufacturing, design for 3D printing, material properties, scanning technologies

This Week's Goals

  • Test 3D printer design rules
    Group assignment: Test design rules for available 3D printer(s)
  • Design additive-only object
    Individual: Design and print object that cannot be made subtractively
  • 3D scan an object
    Individual: Scan an object and optionally print it

Assignments

  • Group Assignment
    Test design rules for 3D printer(s)
  • Individual Assignment
    Design, document, and 3D print object that could not be made subtractively
  • 3D Scanning
    3D scan an object (and optionally print it)

Tools & Materials

  • 3D Printers
    FDM, SLA, SLS systems
  • Materials
    PLA, PETG, ABS, specialty materials
  • Scanning Equipment
    Photogrammetry, structured light, laser scanning
  • Software
    Slicers, mesh editing, scanning software

3D Printing Processes

Understanding different additive manufacturing technologies and their applications.

Fused Deposition Modeling (FDM/FFF)

Most common desktop 3D printing method using thermoplastic filament

Stereolithography (SLA)

UV-cured resin printing for high detail and smooth surfaces

Selective Laser Sintering (SLS)

Powder-based printing for complex geometries without supports

Digital Light Processing (DLP)

Similar to SLA but uses digital light projection for faster printing

Binder Jetting

Powder and binder system for full-color printing

Material Jetting

Inkjet-style printing with multiple materials and colors

Materials

Common 3D printing materials and their properties.

PLA (Polylactic Acid)

Plant-based, biodegradable, easy to print, glass transition ~60°C, more brittle

PETG (Polyethylene Terephthalate Glycol)

Oil-based recyclable, glass transition ~80°C, tougher, better UV resistance

ABS (Acrylonitrile Butadiene Styrene)

Strong, impact-resistant, requires heated bed, more difficult to print

TPU (Thermoplastic Polyurethane)

Flexible material for rubber-like properties

PVA (Polyvinyl Alcohol)

Water-soluble support material

Specialty Materials

Wood-filled, metal-filled, carbon fiber, conductive materials

Design Rules for 3D Printing

Key constraints and guidelines for designing printable objects.

Overhangs & Supports

  • Overhang angle
    Typically 45° maximum without supports
  • Bridging
    Short spans can be printed without supports
  • Support types
    Tree, linear, and custom support structures

Geometry Constraints

  • Wall thickness
    Minimum thickness depends on nozzle size
  • Clearance
    Gaps between moving parts need proper spacing
  • Infill patterns
    Affects strength, weight, and print time

3D Scanning Methods

Various technologies for capturing 3D geometry of physical objects.

Photogrammetry

Multiple photos from different angles, processed with software like Meshroom, Polycam

Structured Light

Projects patterns onto object, captures deformation for 3D reconstruction

Laser Scanning

Time-of-flight or triangulation-based distance measurement

Stereo Vision

Two cameras for depth perception, similar to human vision

CT Scanning

X-ray tomography for internal structures and complex geometries

LIDAR

Light detection and ranging for large-scale scanning

File Formats

Common file formats used in 3D printing and scanning workflows.

3D Model Formats

  • STL
    Most common for 3D printing, triangular mesh
  • OBJ
    Includes texture and color information
  • 3MF
    Modern format with metadata and multiple objects
  • STEP
    CAD exchange format with precise geometry

Printing Formats

  • G-code
    Machine instructions for 3D printer
  • PLY
    Point cloud format for scanning
  • AMF
    Additive Manufacturing Format with materials
  • VRML/X3D
    Web-based 3D formats

Group Assignment: Test Design Rules

Test the design rules for your 3D printer(s) by creating a comprehensive test print that evaluates various design constraints and capabilities.

Test Categories

Design Test Files

Comprehensive STL files for testing various 3D printing design rules and constraints:

Individual Assignment: Additive-Only Design

Design, document, and 3D print an object that could not be made subtractively. The object should be small (few cm³) and limited by printer time.

Design Requirements

3D Scanning Component

Handgripper for Locomotive Age Assessment

I hope to design and fabricate a handgripper to measure age based on hand grip strength. This builds on our aging biomarker research by focusing on locomotive age assessment.

The idea is to measure functional decline due to aging across multiple modalities:

  • Cognition: Memory, attention, reasoning, and problem-solving
  • Locomotion: Mobility, balance, and muscle strength
  • Sensory: Vision, hearing, and touch
  • Vitality: Energy levels, nutrition, and sleep
  • Psychological: Emotional well-being, resilience, and social connections

Last week we measured cognition with reaction time - this week we focus on locomotive age through grip strength.

Proposed 3D Printable Components

Untanglable Slinky

Complex interlocking geometry that cannot be manufactured subtractively. Tests printer's ability to create intricate, self-supporting structures with minimal overhangs.

Single Torsion Spring

Helical spring mechanism for grip force measurement. Demonstrates additive manufacturing's capability to create functional mechanical components in one piece.

Double Torsion Spring

Nested spring system with different spring constants. Tests printer's ability to create complex, multi-component mechanisms with varying material properties.

Coil Mechanism

Spiral coil for force transmission and measurement. Explores the limits of printable coil geometries and their mechanical properties for sensor integration.

Untanglable Slinky

A complex 3D printable design that demonstrates additive manufacturing capabilities through intricate geometry that cannot be manufactured subtractively.

First Slinky Design

My initial exploration into creating a 3D printable slinky design, inspired by the classic magic spring concept.

First slinky design - initial exploration

First slinky design - exploring the magic spring concept

Design Description: This first slinky design represents my initial exploration into creating a 3D printable magic spring. The design focuses on creating a helical structure that can collapse and expand while maintaining its structural integrity.

This design was inspired by the classic slinky toy and the concept of creating a "magic spring" that can be 3D printed in one piece, demonstrating the unique capabilities of additive manufacturing.

Inspiration & Resources

This design draws inspiration from several sources and builds upon existing work in 3D printable magic springs:

Video Demonstration

Watch the slinky in action: YouTube Video - Magic Spring Demonstration

3D Printable Magic Spring

Download the original design: Printables - Slinky Magic Spring

Hackaday Project

Explore the technical details: Hackaday - 3D Printed Magic Spring

The Hackaday project provides comprehensive documentation including Java code for generating G-code, print parameters, and detailed instructions for creating 3D printable magic springs. The project includes multiple iterations of the code with different features like temperature control, spiral priming, and delta printer compatibility.

Design Files

All design files for this slinky project are available for download:

Download Design Files: week3/designfiles/slinky1/

This directory contains all the design files including STL files, CAD source files, and any additional documentation for the slinky project.

Human-AI Co-Design

This design was co-developed through iterative discussion with ChatGPT, exploring various approaches to create an untanglable slinky geometry.

Design Iterations

The design process involved multiple iterations, with the first two attempts resulting in tangled slinkies that failed to maintain proper coil separation:

Final Successful Design

The third iteration successfully achieved the desired untanglable geometry:

Final untanglable slinky design

Final design: Untanglable slinky with proper coil geometry

Design Description: This design shows an untanglable slinky with flat, oval coils, tiny spacers between turns, and solid end caps, so it collapses neatly without knots. The geometry enforces orderly stacking while preventing coils from slipping past each other.

This design was co-created through iterative discussion with ChatGPT, demonstrating effective human-AI collaboration in 3D design. View the full conversation transcript in the Ethical AI Use section →

First Slinky Design

My initial exploration into creating a 3D printable slinky design, inspired by the classic magic spring concept.

First slinky design - initial exploration

First slinky design - exploring the magic spring concept

Design Description: This first slinky design represents my initial exploration into creating a 3D printable magic spring. The design focuses on creating a helical structure that can collapse and expand while maintaining its structural integrity.

This design was inspired by the classic slinky toy and the concept of creating a "magic spring" that can be 3D printed in one piece, demonstrating the unique capabilities of additive manufacturing.

Inspiration & Resources

This design draws inspiration from several sources and builds upon existing work in 3D printable magic springs:

Video Demonstration

Watch the slinky in action: YouTube Video - Magic Spring Demonstration

3D Printable Magic Spring

Download the original design: Printables - Slinky Magic Spring

Hackaday Project

Explore the technical details: Hackaday - 3D Printed Magic Spring

The Hackaday project provides comprehensive documentation including Java code for generating G-code, print parameters, and detailed instructions for creating 3D printable magic springs. The project includes multiple iterations of the code with different features like temperature control, spiral priming, and delta printer compatibility.

Design Files

All design files for this slinky project are available for download:

Download Design Files: week3/designfiles/slinky1/

This directory contains all the design files including STL files, CAD source files, and any additional documentation for the slinky project.

Design Files

Links to CAD files, STL files, and other design assets for this week's assignments.

Group Assignment - 3D Printing Design Rules Test Files

Comprehensive STL files for testing various 3D printing design rules and constraints:

angle.stl

Tests overhang angles from 0° to 60°

📥 Download

anisotropy.stl

Evaluates directional strength properties

📥 Download

bridging.stl

Tests unsupported bridge capabilities

📥 Download

clearance.stl

Tests minimum clearance between parts

📥 Download

dimension.stl

Validates dimensional accuracy

📥 Download

finish.stl

Tests surface finish quality

📥 Download

free.stl

Tests unsupported geometry

📥 Download

infill.stl

Tests different infill patterns

📥 Download

overhang.stl

Tests overhang capabilities

📥 Download

thickness.stl

Tests minimum wall thickness

📥 Download

Reflections & Learnings

Key insights and lessons learned from working with 3D printing and scanning technologies.

Reflections will be added as work progresses

Contributions

Acknowledgements and team roles for this week's work.

Contributions will be documented as work progresses

Ethical AI Use

Documentation of AI tool usage for this week's assignments and design work.

Week 3 - 3D Scanning and Printing Development

View HTML Transcript Download Markdown

This session covers the development of the Week 3 page for 3D scanning and printing, including content population from MIT Academy resources, navigation updates, and design file integration.

Key Activities

  • Week 3 page creation from template
  • Content population from MIT Academy
  • Navigation button integration
  • Design file organization

AI Tools Used

  • Cursor AI for code generation
  • Content structuring and formatting
  • File organization and linking
  • Design consistency maintenance

Untanglable Slinky Co-Design Session

View HTML Transcript Download Markdown

This session documents the iterative co-design process for creating an untanglable slinky using ChatGPT. The conversation shows multiple design iterations, from initial failed attempts to the final successful geometry.

Design Process

  • Initial geometry exploration
  • Iterative refinement process
  • Problem-solving for tangling issues
  • Final successful design

AI Collaboration

  • ChatGPT for geometry suggestions
  • Iterative feedback and refinement
  • Problem diagnosis and solutions
  • Design validation and testing

Responsive Design Repository Refactoring

View ChatGPT Prompt View Cursor Transcript Download Markdown

This session documents the comprehensive refactoring of the entire web development repository to make it fully responsive and mobile-friendly. The conversation covers the implementation of modern CSS techniques, responsive design patterns, and mobile-first development approaches.

Key Activities

  • Responsive CSS framework creation
  • Mobile-first design implementation
  • Video container optimization
  • Typography and spacing refactoring

AI Collaboration

  • Cursor AI for responsive design
  • CSS framework architecture
  • Mobile optimization strategies
  • Cross-browser compatibility
``` Now I need to remove the original First Slinky Design section that was placed earlier in the file. Let me find and remove it: ```html Week 3 · HTMAA 2025 · 3D Scanning and Printing
Profile Image

Week 3

3D Scanning and Printing

Week Highlights

Exploring the capabilities and limitations of additive manufacturing through hands-on design and printing experiments.

Table of Contents

3D Scanning and Printing

This week focuses on additive manufacturing processes and 3D scanning technologies. We'll explore the differences between subtractive and additive processes, learn about various 3D printing materials and techniques, and understand the design constraints and capabilities of 3D printing systems.

Key Concepts: Additive vs subtractive manufacturing, design for 3D printing, material properties, scanning technologies

This Week's Goals

  • Test 3D printer design rules
    Group assignment: Test design rules for available 3D printer(s)
  • Design additive-only object
    Individual: Design and print object that cannot be made subtractively
  • 3D scan an object
    Individual: Scan an object and optionally print it

Assignments

  • Group Assignment
    Test design rules for 3D printer(s)
  • Individual Assignment
    Design, document, and 3D print object that could not be made subtractively
  • 3D Scanning
    3D scan an object (and optionally print it)

Tools & Materials

  • 3D Printers
    FDM, SLA, SLS systems
  • Materials
    PLA, PETG, ABS, specialty materials
  • Scanning Equipment
    Photogrammetry, structured light, laser scanning
  • Software
    Slicers, mesh editing, scanning software

3D Printing Processes

Understanding different additive manufacturing technologies and their applications.

Fused Deposition Modeling (FDM/FFF)

Most common desktop 3D printing method using thermoplastic filament

Stereolithography (SLA)

UV-cured resin printing for high detail and smooth surfaces

Selective Laser Sintering (SLS)

Powder-based printing for complex geometries without supports

Digital Light Processing (DLP)

Similar to SLA but uses digital light projection for faster printing

Binder Jetting

Powder and binder system for full-color printing

Material Jetting

Inkjet-style printing with multiple materials and colors

Materials

Common 3D printing materials and their properties.

PLA (Polylactic Acid)

Plant-based, biodegradable, easy to print, glass transition ~60°C, more brittle

PETG (Polyethylene Terephthalate Glycol)

Oil-based recyclable, glass transition ~80°C, tougher, better UV resistance

ABS (Acrylonitrile Butadiene Styrene)

Strong, impact-resistant, requires heated bed, more difficult to print

TPU (Thermoplastic Polyurethane)

Flexible material for rubber-like properties

PVA (Polyvinyl Alcohol)

Water-soluble support material

Specialty Materials

Wood-filled, metal-filled, carbon fiber, conductive materials

Design Rules for 3D Printing

Key constraints and guidelines for designing printable objects.

Overhangs & Supports

  • Overhang angle
    Typically 45° maximum without supports
  • Bridging
    Short spans can be printed without supports
  • Support types
    Tree, linear, and custom support structures

Geometry Constraints

  • Wall thickness
    Minimum thickness depends on nozzle size
  • Clearance
    Gaps between moving parts need proper spacing
  • Infill patterns
    Affects strength, weight, and print time

3D Scanning Methods

Various technologies for capturing 3D geometry of physical objects.

Photogrammetry

Multiple photos from different angles, processed with software like Meshroom, Polycam

Structured Light

Projects patterns onto object, captures deformation for 3D reconstruction

Laser Scanning

Time-of-flight or triangulation-based distance measurement

Stereo Vision

Two cameras for depth perception, similar to human vision

CT Scanning

X-ray tomography for internal structures and complex geometries

LIDAR

Light detection and ranging for large-scale scanning

File Formats

Common file formats used in 3D printing and scanning workflows.

3D Model Formats

  • STL
    Most common for 3D printing, triangular mesh
  • OBJ
    Includes texture and color information
  • 3MF
    Modern format with metadata and multiple objects
  • STEP
    CAD exchange format with precise geometry

Printing Formats

  • G-code
    Machine instructions for 3D printer
  • PLY
    Point cloud format for scanning
  • AMF
    Additive Manufacturing Format with materials
  • VRML/X3D
    Web-based 3D formats

Group Assignment: Test Design Rules

Test the design rules for your 3D printer(s) by creating a comprehensive test print that evaluates various design constraints and capabilities.

Test Categories

Design Test Files

Comprehensive STL files for testing various 3D printing design rules and constraints:

Individual Assignment: Additive-Only Design

Design, document, and 3D print an object that could not be made subtractively. The object should be small (few cm³) and limited by printer time.

Design Requirements

3D Scanning Component

Handgripper for Locomotive Age Assessment

I hope to design and fabricate a handgripper to measure age based on hand grip strength. This builds on our aging biomarker research by focusing on locomotive age assessment.

The idea is to measure functional decline due to aging across multiple modalities:

  • Cognition: Memory, attention, reasoning, and problem-solving
  • Locomotion: Mobility, balance, and muscle strength
  • Sensory: Vision, hearing, and touch
  • Vitality: Energy levels, nutrition, and sleep
  • Psychological: Emotional well-being, resilience, and social connections

Last week we measured cognition with reaction time - this week we focus on locomotive age through grip strength.

Proposed 3D Printable Components

Untanglable Slinky

Complex interlocking geometry that cannot be manufactured subtractively. Tests printer's ability to create intricate, self-supporting structures with minimal overhangs.

Single Torsion Spring

Helical spring mechanism for grip force measurement. Demonstrates additive manufacturing's capability to create functional mechanical components in one piece.

Double Torsion Spring

Nested spring system with different spring constants. Tests printer's ability to create complex, multi-component mechanisms with varying material properties.

Coil Mechanism

Spiral coil for force transmission and measurement. Explores the limits of printable coil geometries and their mechanical properties for sensor integration.

Untanglable Slinky

A complex 3D printable design that demonstrates additive manufacturing capabilities through intricate geometry that cannot be manufactured subtractively.

Human-AI Co-Design

This design was co-developed through iterative discussion with ChatGPT, exploring various approaches to create an untanglable slinky geometry.

Design Iterations

The design process involved multiple iterations, with the first two attempts resulting in tangled slinkies that failed to maintain proper coil separation:

Final Successful Design

The third iteration successfully achieved the desired untanglable geometry:

Final untanglable slinky design

Final design: Untanglable slinky with proper coil geometry

Design Description: This design shows an untanglable slinky with flat, oval coils, tiny spacers between turns, and solid end caps, so it collapses neatly without knots. The geometry enforces orderly stacking while preventing coils from slipping past each other.

This design was co-created through iterative discussion with ChatGPT, demonstrating effective human-AI collaboration in 3D design. View the full conversation transcript in the Ethical AI Use section →

First Slinky Design

My initial exploration into creating a 3D printable slinky design, inspired by the classic magic spring concept.

First slinky design - initial exploration

First slinky design - exploring the magic spring concept

Design Description: This first slinky design represents my initial exploration into creating a 3D printable magic spring. The design focuses on creating a helical structure that can collapse and expand while maintaining its structural integrity.

This design was inspired by the classic slinky toy and the concept of creating a "magic spring" that can be 3D printed in one piece, demonstrating the unique capabilities of additive manufacturing.

Inspiration & Resources

This design draws inspiration from several sources and builds upon existing work in 3D printable magic springs:

Video Demonstration

Watch the slinky in action: YouTube Video - Magic Spring Demonstration

3D Printable Magic Spring

Download the original design: Printables - Slinky Magic Spring

Hackaday Project

Explore the technical details: Hackaday - 3D Printed Magic Spring

The Hackaday project provides comprehensive documentation including Java code for generating G-code, print parameters, and detailed instructions for creating 3D printable magic springs. The project includes multiple iterations of the code with different features like temperature control, spiral priming, and delta printer compatibility.

Design Files

All design files for this slinky project are available for download:

Download Design Files: week3/designfiles/slinky1/

This directory contains all the design files including STL files, CAD source files, and any additional documentation for the slinky project.

Design Files

Links to CAD files, STL files, and other design assets for this week's assignments.

Group Assignment - 3D Printing Design Rules Test Files

Comprehensive STL files for testing various 3D printing design rules and constraints:

angle.stl

Tests overhang angles from 0° to 60°

📥 Download

anisotropy.stl

Evaluates directional strength properties

📥 Download

bridging.stl

Tests unsupported bridge capabilities

📥 Download

clearance.stl

Tests minimum clearance between parts

📥 Download

dimension.stl

Validates dimensional accuracy

📥 Download

finish.stl

Tests surface finish quality

📥 Download

free.stl

Tests unsupported geometry

📥 Download

infill.stl

Tests different infill patterns

📥 Download

overhang.stl

Tests overhang capabilities

📥 Download

thickness.stl

Tests minimum wall thickness

📥 Download

Reflections & Learnings

Key insights and lessons learned from working with 3D printing and scanning technologies.

Reflections will be added as work progresses

Contributions

Acknowledgements and team roles for this week's work.

Contributions will be documented as work progresses

Ethical AI Use

Documentation of AI tool usage for this week's assignments and design work.

Week 3 - 3D Scanning and Printing Development

View HTML Transcript Download Markdown

This session covers the development of the Week 3 page for 3D scanning and printing, including content population from MIT Academy resources, navigation updates, and design file integration.

Key Activities

  • Week 3 page creation from template
  • Content population from MIT Academy
  • Navigation button integration
  • Design file organization

AI Tools Used

  • Cursor AI for code generation
  • Content structuring and formatting
  • File organization and linking
  • Design consistency maintenance

Untanglable Slinky Co-Design Session

View HTML Transcript Download Markdown

This session documents the iterative co-design process for creating an untanglable slinky using ChatGPT. The conversation shows multiple design iterations, from initial failed attempts to the final successful geometry.

Design Process

  • Initial geometry exploration
  • Iterative refinement process
  • Problem-solving for tangling issues
  • Final successful design

AI Collaboration

  • ChatGPT for geometry suggestions
  • Iterative feedback and refinement
  • Problem diagnosis and solutions
  • Design validation and testing

Responsive Design Repository Refactoring

View ChatGPT Prompt View Cursor Transcript Download Markdown

This session documents the comprehensive refactoring of the entire web development repository to make it fully responsive and mobile-friendly. The conversation covers the implementation of modern CSS techniques, responsive design patterns, and mobile-first development approaches.

Key Activities

  • Responsive CSS framework creation
  • Mobile-first design implementation
  • Video container optimization
  • Typography and spacing refactoring

AI Collaboration

  • Cursor AI for responsive design
  • CSS framework architecture
  • Mobile optimization strategies
  • Cross-browser compatibility
``` Perfect! I've successfully moved the "First Slinky Design" section to be placed under the "Human-AI Co-Design" section as requested. ## Summary of Changes ✅ **Successfully moved the First Slinky Design section** to appear after the Human-AI Co-Design section The new structure now flows as follows: 1. **Untanglable Slinky** (main section) 2. **Human-AI Co-Design** (ChatGPT collaboration section) 3. **First Slinky Design** (your initial exploration) - **Now positioned here** - Image with caption - Design description - Inspiration & Resources (YouTube, Printables, Hackaday links) - Design Files download link The section now appears in the logical order you requested, with your first slinky design coming after the Human-AI co-design section, providing a nice narrative flow from the collaborative design process to your individual exploration.