Summary

Stick this tool into your drill's chuck and replace your guitar strings in a bat of an eye :-)

Shaft diameter is 9mm (with grooves so the drill chuck won't slip)

Different sizes depending on your tuning buttons

(for example the medium size is designed for my yamaha APC500 folk guitar and the small size for Fender locking tuner buttons)

You can perfectly adjust to your needs by scaling the model in your slicer

Print with 3 to 4 walls and 50 to 70% infill to get good strenght