Micromake C1 upper bearing assembly modification

This is a modification of the upper bearing assembly of the Micromake C1.
The stock assembly has poor load bearing characteristics, that cause the whole assembly to flex and misalign the bearings and the belt. This misalignment causes the belt to wear prematurely (visible after just 16 hours of operation).

This modification replaces the stock assembly and has much better load bearing characteristics, keeping the bearings and the belt perfectly aligned, reduces vibrations as well. Belt tensioning functionality is maintained.

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