This week I wanted to replace a belt buckle that I hate.

The belt buckle that I hate and want to replace.
The belt buckle that I hate and want to replace.
CAD design for new belt buckle
CAD design for new belt buckle
CAD design for new belt buckle
CAD design for new belt buckle

Preform preparation for print.
Preform preparation for print.
Are the supports necessary?

During class, I learned that it is really undesirable to just make the mold around the part. So I prepared a printable cast.

insert screenshot of cad file

Anthony recommended using a layer of wax to get a smooth finish. The only wax I had around was a lipbalm, but it worked great!
Anthony recommended using a layer of wax to get a smooth finish. The only wax I had around was a lipbalm, but it worked great!
The mold after wax and light heat gun for finish
The mold after wax and light heat gun for finish
I used some smooth-on in my lab that was fast acting, starting to solidify within 60-90 seconds. This made it challenging to mix and pour larger amounts of the material.
I used some smooth-on in my lab that was fast acting, starting to solidify within 60-90 seconds. This made it challenging to mix and pour larger amounts of the material.
The mold after removal
The mold after removal

Notes

I wanted to emboss text, but since I curved the text and wanted it to lie on a surface that curves in more than one direction - fusion would not give in.

I saw other people had taken a detour to adobe illustrator, so I did the same. I turned off the grid in fusion, took a screenshot of the text in fusion, and saved it as a jpg. I imported the jpg to illustrator > Image Trace > dropdown select “silhouettes” > press “expand”. Then right click on the outlined text, export selection> choose format svg. Back in fusion > Insert > insert svg.

Instead of using emboss feature (unless it works for you), extrude each letter individually and at place at exactly the position you want to join or cut with the larger target body (belt buckle). Then use combine to create one body that has all the features and can be exported as .stl to prepare for a print.

  • If i get a chance to cnc a wax part for the mold, I will add positive and negative spheres in corners to register the molds together.

Plans:

I plan to 3d print the buckle and to create the mold by hanging the belt buckle by a string covered by a straw into a cup which I will fill with oomoo. Then I will cut the mold in half to release the belt buckle, but not all the way through so it should be easy to align. First cast with plastic, then hopefully with metal!