Timing pulley, MXL, 22 Tooth, 5mm bore
thingiverse
The MXL belts, commonly found in junk flatbed scanners, fit with a 5mm bore that works for most NEMA 17 stepper motors. Obtain additional MXL belts from McMaster-Carr at http://www.mcmaster.com/#mxl-series-timing-belts/=f8ej07. When printing the nut trap, ensure it's sized for a M3 nut and let it cool before removal to avoid distortion. Print four at once to allow cooling between layers without a fan. For better pulley performance, carefully ream with a 5mm drill to enhance the center hole's concentricity with the teeth.
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