25XL037 10mm bore timing belt pulley
thingiverse
TinkerCad Link: https://www.tinkercad.com/things/9NUnae6U8LJ I created this for use with the Rotary 4th axis for CNC. There are holes that can be tapped for M3 to tighten the timing gear down onto the 10mm shaft / bolt. I drilled a through hole on my shaft and have a 30mm M3 bolt going all the way through. I used a tapered head bolt so it would sit flush with the flange to avoid it hitting the body when rotating. https://www.thingiverse.com/thing:1877336 I may modify the flanges a bit to print cleaner but for now it works.
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