Z-Axis Top Bracket with Bearing Stabilizer, HICTOP Prusa i3

This is a printed-bearing stabilization upgrade for the brackets at the top of the Z-axis rods on the HICTOP Prusa i3, extruded aluminum version, and similar printers. The design is fully parameterized with OpenSCAD to facilitate adaptation to other printers.

This is a remix of my previous attempt at this, but improved to include a threaded bearing and with better stabilization of the smooth rods. I saw several designs here for using 608 bearings, but it seems to me those do not hold the thr