Printed BB filled Linear Bearing (BYOBB)
thingiverse
This linear bearing features four tubes filled with copper BBs or steel shot, and has a cap secured by two screws. The 6mm and 8mm versions are available, as well as a new 1/4" circulator variant. To make your own, use 1.77mm BBs or steel shot; printing at .2 layer height is recommended due to 3D printer limitations. For strong bonding, glue the ABS parts with acetone and melted plastic, while PLA offers better durability. The creator considers this part highly useful among his projects.
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