Remixed Z-Axis Stabilization

Even with the anti-black-lash leadscrew, the Ender 5 bed tends to drop once powered off, particularly with mirror or glass beds.

One of the major causes for this is the z-axis leadscrew tends to suffer from axial precession (wobble).

This add-on fixes the issue, and will also stabilize the bed considerably.

In the original model, the hole was undersized (too tight tolerance) and I didn't have a drill to expand the hole, this version of the model doesn't require expansion of the hole.