It originates from this other model of mine on Thangs

M2 / 2.5 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / 10 / 11 / 12 on the front with screw holes

On the back there are hex slots to measure M2 - M12 nuts with corresponding size

It could measure screws length from 4 to 70 mm.

How to print (these are my specific Ultimaker Cura settings in 3mf project)

• 0.12 mm layer height
• 1 wall/perimeter count
• 15-20% infill
• slow print speed (50-80 mm/s) and slower speed on initial layers for better adhesion
• support (approx. 1 mm) for overhanging hex nut slots