Ender 3 V2 Bed Cable Drag Chain Mount (Under PSU)

Inspired by but NOT remixed from Pugwash's design (https://www.printables.com/model/201535-ender-3-v2-cable-chain-connector). This is a full redraw.

I designed this because I printed Pugwash's model and realised the Z axis cable got stuck behind the PSU's power switch and would rather comically shut down the printer whenever the bed moved forwards. This design fixes that by adding two channels and a cutout in the side for the Z axis cable. I haven't yet uploaded any pictures of the cables in the channels because they are held in by the surface below the printer. I'll add some sort of clip to hold them in better at some point.