Bambu XY stepper pulley
thingiverse
I had a stepper die and bambu warranty took a few days too long to get back to me, so I cut out the resin from the factory stepper pulley to measure it and modeled one I could put on a regular nema 17 motor. I mostly did it because it really seemed like they didn't want me to and putting a pulley on a stepper motor with epoxy from the factory so you can only use their stepper motors is absurd. I printed in resin and it fit just right but you may have to do some hole horizontal expansion to match your printer.
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