I used this test pieces for my clamps. For me it was useful to play around with different thread types, offsets etc. For that reason I've attached the fusion file that you can see what thread types I've used or to give you a starting point for your own tests. I used them here:
Printer Brand: Prusa
Printer: i3 MK2S
Rafts: No
Supports: No
Resolution: Tested with 0.2. But 0.15, 0.1, 0.05 should work, too
Infill: 10-30%
The author marked this model as their own original creation. Imported from Thingiverse.