A parametric spiral cup that can be used as a toothbrush holder, a pen/pencil holder, etc. Prints with no supports for modest spiral angles. Made in OpenSCAD.
Design: spiral_cup.scad (OpenSCAD)
STLs: spiral_cup.stl
Recommended Print Settings: 0.30mm layer height, 20% infill, no supports
Thingiverse: https://www.thingiverse.com/thing:3714080