This is a customizable bolted clamp for use with an optics mounting post. Sometimes you need to hold something heavier in place, or just out of the way, and don't mind scratching the rod/post.
The default STL is for an 8mm post with M3 bolts and nuts.
This component was inspired by the Open-source optics project, whose goal is to radically reduce the cost of scientific optical hardware, by the Michigan Tech's Open Sustainability Technology Research Group.
OpenSCAD code included for modifications. Just print on your favorite 3D printer and clean up. For stability/strength, this part may need 25% or more infill. I have not needed supports when printing with PLA or ABS.