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These are untested on a stock machine as I'm using a Rapido UHF and my toolhead sits lower than stock but I've been running them for a few weeks now.

The Z endstop has to be removed for this mod but I assume most people are using some sort of probe.

I'd recommend printing with supports on the bed so the top faces for the bearing and extrusion are clean.

Key Points:

• Slightly improves rigidity.
• Perfectly aligns with motor shaft so it will prevent any binding on Z.

Required Hardware:

• 2x 608Z Bearings
• 4x M5 8mm
• 4x M5 spring nuts or T-nuts