Ultimaker Timing Pulleys
thingiverse
Create robust timing pulleys for an Ultimaker-style printer by combining inexpensive polycarbonate MXL timing pulleys with aluminum spacers. To do this, grind a notch on a spring clamp end to overlap the 8mm shaft by at least 3mm and drill/tap aluminum spacers for set screws (use M3 set screws). Rough up one flat face of the spacers with sandpaper in two directions for a crosshatch effect, ensuring epoxy adheres well. Clean both pulley and spacer with alcohol, applying mixed epoxy to the flange, placing the assembly on an 8mm shaft, clamping it together, and removing it after drying for 6-8 hours. Tighten set screws evenly to prevent uneven pressure. This method has been successfully used in an Ultimaker-style printer at the TX/RX hackerspace in Houston, Texas.
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