Found a lot of key holders that use a lot of filament, so decided to make my own minimalistic key holder.

Printed the 6 hooks model with 0.28 layer height. The others models should work fine as well. The screw holes have a diameter of 5 mm.

Supports: Not needed, the overhang is 45 degrees, which most printers can handle.

Adhesion: No need.

Model: If you want to change the model, open the .ipt file using Autodesk Inventor. There are some helpful parameters in there that should help you change the model to what you want.