Motor Cap - 6mm Shaft

My temporary solution to a lost motor cap.
LH => Left-handed threads
RH => Right-handed threads

I made it with PLA and have only tried using it once. They seem to fit well, but it flew off with my prop the first time I tried to take off. I think I may have over-tightened and wore away at the threads.

Let me know if you have any success with other materials.

I plan on printing out some with a smaller thread size to hopefully get a tighter fit, and if they work I'll upload them here.