Bearing
thingiverse
A support I created for components on my RC halftrack design requires Colt 5.95mm airsoft BBs and three fasteners. Thread the fasteners through one ring, then place it on a flat surface and position the middle ring inside. Next, surround the center ring with about ten airsoft BBs as shown in the picture. Apply a small amount of grease and push the second center ring over the fasteners. You can choose to add nuts and washers if desired. This bearing moves smoothly and is extremely robust, with only a slight degree of play.
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