Our team ran into a couple issues with collar clamps this year. First, we needed A LOT! Our intake, ball holder, climber, and drive train all required 1/2" hex collar clamps. After finding our usual on-line sellers out of stock or having to wait a week or more for shipping we designed and 3D printed our own. They work great, though don’t expect them to handle the same stress as a metal clamp. If your team is running low, needs to cut some weight, or you need a pile of extras for prototyping, download and print a bunch. There are two sizes for different size cap screws (1/4-20 and #6-32).
STEMpunk 4531 ~ Two Rivers, WI