I'm thinking that a collator isn't going to work for bullets no longer than they are wide. Is that the case?
I failed at my latest proximity sensor tool.....two things.....I forgot the slot for the wings on the end (dumb, forgetful)....and I found that, at the tiny layer height, the threads are too wide, and the sensor just slides in.....so I erased the posts on it and went back to the drawing board.
Also, I do not think my slicer deals well with horizontal threads.....at the top closure there ARE no threads....looks like a bandaid up there. Must be doing something wrong, but I don't have a clue yet. I may be back to two prints for one tool.