This is a quick release clamp similar to a bicycle seat clamp. I took the orginal model and made it 3d printable. It uses a m3 bolt.

I was orginaly intending to use it for the quick release sla build platform by seanhan. https://www.thingiverse.com/thing:2422444

I'm sure it could be used for other applications too. Its not as strong as an aluminum one, but it is cheap to make, and can be made in a couple hours.