Small Pulley Bearing Covers
thingiverse
These covers can keep string on pulley bearings found in a lift mechanism, like those from REV Robotics (http://www.revrobotics.com/rev-41-1368/). They should work with similar bearings that are 3mm in ID, 12mm in OD, and 4mm wide. Small M3 washers must be placed between the bearing and the cover. For instance: http://a.co/b0xFqGR
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