688 Idler for Printruder II
thingiverse
The original 626 bearing-based idler on the Printruder may not fit the timing belt pulley; thus, a redesign using a narrower 688 ball bearing (4mm depth) is suggested for compatibility. Credit to Zaggo for the Printruder II design. The new idler employs an M8x20 bolt and comes with a 1mm wall thickness on the bearing side for improved printing quality and reinforcement. Additionally, a Sketchup template of the idler block is included in case users wish to experiment with other sized ball bearings.
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