Nema 17 stepper motor damper
thingiverse
I'm using a flexible filament and printing with 100% infill, as the part is just 2mm thick. I've already tried this on an Ender 3 with pressed-on pulleys and printed with TPU - it didn't throw off the belt alignment too badly. You'll likely need longer screws when attaching these between the frame and the motor.
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