Stereographic Projection

thingiverse | Free

This model is featured in figure 3.12 of Visualizing Mathematics with 3D Printing. ...

Customizable Vacuum Tool

thingiverse | Free

Can be customized to fit any vacuum cleaner, you can control:Nozzle length, overlap ...

Customizable Uhook

thingiverse | Free

Parametric hook, universal and very strong.How to use this file to make your own ...