Shower holder knob

In my apartment shower, the knob used to tighten the holder to the vertical rod had become loose due to tear and wear in the thread, so of course a new one had to be produced.

I used the following libraries:
http://dkprojects.net/openscad-threads/
http://www.thingiverse.com/thing:32122

The knurled part takes almost forever to render in OpenSCAD, but the result speaks for itself: Awesome!