Printed 80t timing pulley - 6mm belt- using a GT2 20t timing pulley - 8mm or 5mm bore

This uses four m3x8 screws and a gt2 20teeth timing pulley with either 8mm or 5mm bore

The front "lip" of the gt2 20t pulley will pop off easily with pliers

make sure to keep pressing on the gt2 20t pulley while securing the screws.
 
I made this to use it on my belted ender mod: here