Summary

i modified the original design (https://www.thingiverse.com/thing:6211252/ by Gixxerfool) to fit my welder, which has a 17mm handle bar (foam wrapped so it has some flex to it)

i designed it with a bit of a flex clamp. the bigger hole accepts a M3 x 4 x 4 insert, and the other hole is 3.2mm to allow an M3 screw to pass through, which acts as a clamp once the welder is loaded.

however, I ended up just using a clamp :) much easier and strong enough for the operation.

This is my remix design and ported over from Thingiverse as I recently jumped on the Bambu bandwagon https://www.thingiverse.com/thing:6260955