Parametric wall knob inspired by Ikea

I've got a bunch of the Ikea Grundtal knobs for hanging up towels and such but wanted a couple in my bedroom for hanging up robes. The dimensions are not identical to the Ikea knobs and the interior of the knobs is probably completely different. The important dimensions are all parametric so you should be able to modify it to your needs. If you want to modify it, you'll need the simplethreads.scad library from the source element (also included in my files) - just place it in the same folder or put it in your library folder.