Linear bearings
From
Problem
Approach
Axial Bearings
Thrust Bearings
Combined axial / thrust bearing
Linear Bearings
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Linear bearing
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Linear bearing
Current Components
6mm balls: https://www.amazon.com/gp/product/B00SI9UM7G/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1