Here is an Inventor 2020 file to generate GT2 3mm pulleys. You modify the number of teeth by adjusting the “Teeth” parameter in Manage–>Parameters.
The design currently has a 1/16" spacer on one side. It also has a 0.015" tolerance for the 1/2" hex that works well with our 3D printer. YMMV.
The plan is to create an iLogic template for this in the offseason.
Pulley Generator GT2 3mm 0.500 Hex.ipt (392.5 KB)