Designed after reading a post from the unofficial hypercube group on Facebook, Had problems with with prints no always attributed to "Z" banding issues.
It was the weight of the heatbed setup so now the whole weight of the heatbed assembly is sitting on the collar & not the coupling.
2 Versions, 1 has a cutout at the side which gives me an extra 15mm due to the aluminum angle assembly on my machine, the second version has no cutout.
Designed to take both 8mm & 10mm threaded Rods, 8mm Rod use a 608zz Bearing, 10mm Rod use a 6900zz Bearing ( or Similar ).
locate the collars 19 - 20mm from end of screw, this will place the threaded rod approx 8mm into the coupling assuming you have a standard 25x19mm coupling located approx 5mm on the stepper motor shaft.