Hypercube Evolution extruder mount - square nut remix

I'm in the process of putting together a Hypercube Evo, but I'm attempting to do it without using heat-insert nuts.

There's remixes available of most of the parts required, but I couldn't find a suitable extruder mount - one design eliminated most of the heat-insert nuts but still required some to support the endstops, and several other designs don't design the nut slot 'ceilings' to be printed without supports, requiring supports to be placed inside the nut slots which is a pain in the ass to remove.

I recreated the design in OpenSCAD, remaining faithful to the original design instead of trying to do anything new/innovative. The holes in the ceiling of the nut slots and endstop mounts are supported by bridges, allowing printing without supports.

If you've got bridging dialed in well on your printer, you shouldn't need supports. I placed supports under the extruder mount (where the fan nozzle goes) but nowhere else.

Make sure you follow the printing instructions (0.2mm laye