Another RMU alternate connection point

Basically just rotated the entry points on the mid-section.

I'm using this with the top-section from https://www.printables.com/model/81748-remix-mmu2s-buffer-inspired-by-rmu-buffer with ptfe connectors to the top (see 3rd photo)

This allows me to place the unit dead centre behind my MMU (which I've slightly lowered due to room constraints).

Only the mid-section stl is attached.