Serpentine PolyV J,L,M Pulley, Customizable

thingiverse

This is a customizable family of pulleys for multi-rib belts, such as the serpentine belt on a car, a clothes dryer, a vacuum cleaner, a treadmill, etc... See https://en.wikipedia.org/wiki/Belt_(mechanical)#Multi-groove_belts. The diameter, bore, number of ribs, belt profile (poly-J, poly-L,poly-M), and the stub with the M3 grub-screw nut-trap are all customizable. Drop an M3 nut into the trap, and thread through it with an M3 to get a solid attachment to the shaft. I use a treadmill motor with the metal poly-J pulley with a 600J4 belt to drive a wooden lathe with a crowned 12" plywood pulley as if the 600J4 belt was a flat belt. After I wrote this, I found [Round belt pulley Creator](https://www.thingiverse.com/thing:3013341) and [Multiwedge Belt Pulley Creator](https://www.thingiverse.com/thing:3960281) which might meet your needs if this design does not.