MM2 Z-Rod LM10UU Bearing Mount
thingiverse
For seamless Z-axis movement, steer clear of self-aligning linear bearings, which are essentially binding bushings. Affordable LM10UU Linear Bearings can be easily sourced online, with sets of four available for as little as $14 with free shipping. Snap rings keep the bearings in place; find them at your local ACE hardware store. My recommended settings include a .2mm layer height, two shells or perimeters, and 25% infill. Two different revision files are attached: REV3 features screw holes in the center of the part for top mounts but sacrifices some Z-height, while REV4 has screw holes on top for both bottom and top mounting - I currently use this setup.
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