To be able to clamp round parts i designed a 3 point clamp that can be printed. Its not that easy to print since good tolerances and strong parts are needed. Better tolerances lead to less play and therefore better clamping.

I used 4 outer lines and 25% infill with 0.6 nozzle for the parts. I used ABS but PLA or PETG will definitely also work. PLA is much stronger than most people think. I attached 2 pictures that show my printing orientation. The top and bottom part are designed in a way that the middle hole will be printed closed. Therefore the printer will add 1 Layer of bridging there to generate a nice overhang. This single layer can be opened after printing with a drill, pen knife e.g. 

The attached gcode files are only to show some of my print settings. I printed them much faster on my voron but this site here wont take it because of my Start code. So I added my mini+ settings if you want to look at them.

The Parts will be connected by a M4x38 /40 screw. Lubrication might help but i didn't need it.

In the future I will maybe also add different shaped clamps.

Happy printing ;)