This is an optional mod for the Hypercube 300 3D Printer. If you want to have the smoothest, fastest, most rigid Z axis assembly this is it.
If you are building a Hypercube 300 with standard 440mm Y extrusions the included alignment tool STL will perfectly center and align the ball screw mounts and print bed in the frame.
Big thanks to Lee Buxbaum on the Facebook Hypercube group for the inspiration!
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I printed all my parts in PLA. It's rigid and it works great. Only need to use support on the lower motor/bearing mounts.