3D Printing
Design
Design your model in the CAD software of your choice. Usually .stl and .obj files are good for 3D printing.
Printing
Prusa
You'll need to slice your model using the Prusa slicer.
https://www.prusa3d.com/drivers/
uPrint
You can adding .stl's using the computer next to the uPrint in the EDS shop. You can change the orientation to determine how the part is printed before adding it to the pack.