A comfortable guitar winder, optimised for quick printing (35mins for me).

Vitamins:
1x woodscrew;

Min: 3mm threads, 15mm long.

Max: 6mm threads, 28mm long

You can print and then drill it for any screw up to 6mm threads, 28mm long. The plastic surrounding the screw is 10mm dia to allow you to use whatever screw you can find/rob from a door handle.

I tried making them vitamin free but couldn't get anything strong and smooth enough.

Some feedback on the size of the head would be useful as I only have my guitars to measure.