Timing pulley, MXL, 22 Tooth, 5mm bore
thingiverse
This fits the MXL belts found in many junk flatbed scanners. The 5mm bore fits most NEMA 17 stepper motors. MXL belts can also be sourced from Mcmaster-Carr. http://www.mcmaster.com/#mxl-series-timing-belts/=f8ej07 Instructions Print, clean up and use. The nut trap is sized for a M3 nut. I printed 4 at a time to allow them to cool between layers without a fan. Let them cool before you remove them from the print bed to avoid distortion. Careful reaming with a 5mm drill will make for a better pulley. You want the center hole to be as concentric with the teeth as possible.
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