Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:887715.

A manual marbletrack. Just place a standard glass marble (mine are 16.5 mm diameter) and it will roll to the bottom. I have to fight the urge to keep doing it...   https://www.youtube.com/watch?v=BSx1ZfvO8sc  

** Now (July 2022) with the OpenSCAD code for personal customization. **
(NB: best to download and use locally, the Thingiverse Customizer doesn't do it)

I wanted to stress my printer, and a spiral came to mind. After printing a flat spiral I thought of using the "track" for something. Thing #58406 was the baseline for the second code version.  

Helical Sisyphus

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:506634.

This design is part of the *Platonic Solids*. This version is hollow. I use it a test bed for 3D printer quality (and slicer software). It prints quickly. Has also been used as giveaway prints at exhibitions.  

(The green picture shows quality differeneces in 2012. The rightmost is from Shapeways.com, the leftmost from a very early RepRap)

Octangula, Hollow

Activity related to collaborating with others on models

Likes, comments, and activity from your community

A roundup of models that we think you'll like

For when we think someone might have posted your content as their own

New content from your premium memberships

Emails and messages from designers you follow

Msquare

Achievements

Seedling

Helical Sisyphus

Octangula, Hollow