MP Select Mini Threaded Rod De-Wobbler Coupling

This is a replacement coupling to connect the Z-Axis Stepper Motor to the Threaded Rod in the Monoprice Select Mini 3D printer. This is intended to replace the factory coupler, which has been reported to cause the rod to be misaligned and introduces wobble into the Z motion. This causes a banding effect in prints.

I have also included a Flex Coupler to try and address those of you who have alignment issues with the Threaded Rod and the Stepper Motor.

The complete detailed instructions for this modification are documented in my Hack-A-Day Project Log:

https://hackaday.io/project/14823-monoprice-select-mini-maximum-3d-printer-mods/log/51880-dont-go-wobbly-on-me-now