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:

• Screw clamp: https://goo.gl/LvzV1z
• C/G-Clamp: https://goo.gl/UhVrjq

Print instructions

Category: 3D Printing Tests Print Settings

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%