Door knob with better grip

The inner doorknob of our front door is very small. Therefore an adapter with a better grip was needed. I developed it with OpenSCAD on the
"Customizable polygonal rod and wheel with grip and numbers"
https://www.thingiverse.com/thing:3341986.

The basic shape still got a front flat finish, simply created with tinkercad.

- Update Version 2: code cleared, door_knob-front_v2.stl added and with $fn=120;