Unimat SL pulleys

These are pulleys for a 6mm ID shank motor and 5mm thick round belts.
Originally designed for the unimat SL1000 lathe.
They have failed me on my small motor but it could be running too fast and heating the plastic - which got pretty hot. You can try it on yours, at lower than 2000 rpm speeds.
Alternatively try printing them in some other material that is more heat resistnat than PLA.
See these in:
https://www.youtube.com/watch?v=WcsolBTos4k