Ball bearing module
thingiverse
Ball bearing module designed as a replacement for short Adafruit-like linear bearing modules features mounting holes spaced 18mm apart and 24mm apart. Intended for use with 8x3x4 ball bearings, such as the MR84-2RS. To prepare the module for use, thread must be manually cut to accommodate 4mm bolts which can then be screwed in. Modified carriage - http://www.thingiverse.com/thing:451373
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