DIY Laser Glass-Rotary

Simple rotary device for engraving glass and similar.
Max. diameter: 60mm (Without baking: 80mm)

Wooden panels 4mm thick
Foam rubber 1mm thick
1 stepper motor (e.g. NEMA 17)
1 adapter axle 5mm to 8mm
2 ball bearings inside 8mm, outside 22 diameter
Axle length ~30mm, 8mm diameter
1 suitable compression spring
1 hexagon screw length ~100mm, 8mm diameter
Various screws and nuts.