Mechanical Pen Cup & Desk Toy

Summary

I decided to make a mechanical pen cup/desk toy for the May 2022 Printables competition. All parts can be printed without supports. I added a little bit of lithium grease to the printed shafts for smoother operation, but this is not strictly necessary.

I've designed two cup options, which screw on to the 24 tooth gear with a printed thread. Please feel free to remix the cup part and design your own. It's an M14x2 thread. I offset the faces of the thread by .1mm in all directions and filleted the facets to allow for 3D printing tolerances and extra thread durability. 

https://youtube.com/shorts/sJZsHDN3jYg?feature=share

Print Settings

I added cylindrical modifiers in PrusaSlicer to increase the infill to 100% for the shafts on the base/platform. All other parts can be printed with 3 perimeters and 15% infill.

v2 Platform (noted in STLs below)

I printed a bunch of these for my kids and their friends, and found that often the snaps on the shafts would break with certain types of filaments. 

I redesigned the platform to separate the shafts from the platform, and refine the design so that the shafts can be replaced, and also refined the shaft design for the 12 tooth gear to use a screw cap instead of a snap fit. The snap fit part for the 24 tooth gear has also been redesigned and is a little stronger. All other parts are the same.