A (semi-parametric) tie holder.
I redid the design in openscad, so it's semi customizable now.
The design as laid out is for a 8mm diameter rod; the hook itself has a 10mm diameter, which lets it slide easily but doesn't let it unhook without force.
Modify the scad file to change:
- number of holders
- width/height of holders
- closet rod radius
- thickness/depth of walls
(Print these with 1 extra shell and pretty high fill percentage.)