M3 Thumbscrew

This is an M3 thumbscrew head that I designed to be a very snug fit on M3 hex screws. The heads I made it to fit are ~5.4mm in diameter and ~3mm in height. To accommodate a reasonable level of torque, these were made to be a very tight fit on these screws. It helps screw the screws in first in order to hold them in place before forcing these thumb caps on them.