mount pads
thingiverse
I built circular supports for my printer mounting platform and my variac housing - one is sloped down to let a screw go under, the other is angled in for a nut - both were designed with 3mm bolts in mind along with the matching nuts that fit those bolts perfectly.
Download Model from thingiverse
With this file you will be able to print mount pads with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on mount pads.