My advice is to slice on a .25 mm layer with 40% infill and a solid infill every 15 layers. This makes it both light and strong.
I have uploaded 2 files for each component, one as it is and one with a programmed 0.2 mm raft, whenever you need that. The ones with "R" or "raft" in the name have the raft.
Finally, the "MOUNT-all" file has all components on the build plate for a complete set of clamp plus 2 knobs.
For the clamp, a 6mm hex bolt is inserted from one half and the clamp is tightened by the key, in which a hex nut should be pressed.
For the knobs, 2 halves should be glued with cyanoacrilate while compressing with , again, a 6mm bolt through both halves.
Thomas