48 Tooth Abec 11 Flywheel 97mm Wheel pulley

thingiverse

Here is a pulley that slides in instead of being bolted on to an Abec 11 Flywheel. The only hardware it requires are six 20mm M3 screws for extra strength, but they may not be necessary if you use a plastic that's stronger than PLA. I've had great success using PLA and 60% infill along with screws. The 9mm belt won't need any supports, but the 12mm and 15mm belts probably require some.