Bearing block designed to work with 6mm or 1/4" threaded rod framework. Ball bearings are 4.5mm diameter, which is the same a BB ammunition, 11 are needed.
The bore is 1/4" diameter. Inserting the threaded rod through the holes, after assembly, will act as a retainer for the inner race.
Mounting holes are spaced 20mm apart.
Dimension drawing to come in the near future.
I use Cura. First layer is 0.25mm. I like to scale parts 1.01 to allow for shrinkage.
I just used petroleum jelly as a lubricant.