Concept for linear motion

thingiverse

This component accommodates 4x608 bearings against a 3/4" square tube, on opposite sides. Manufacture two of these parts for top and bottom assembly; insert four bearings and fasten them with rod through the bearing centers. Finally, bolt both halves together. In the depicted image, temporary use of hot glue stick pieces was made due to unavailability of 5/16" or 8mm pre-cut rods; this design is still under development, as only one side has been printed so far.