I used to have the cable harness on my M2 cable-tied to the outside of the printer's frame on the right side. However, when I installed the dual extruder upgrade, I quickly discovered that the wire harness interfered with the filament spools, which were also on the right side. So I moved the wire harness to the inside of the frame. There, though, it has barely enough room and brushes up against the heated bed bracket. So I designed a channel for the cable harness that puts the cables behind and in line with the frame, where they are not in the way of either the Z-stage assembly or filament spools on the right side. And it keeps things neat and tidy.

This part needs to print vertically, as that is the only orientation that does not put filament layer separation lines in the same direction as stress points, especially when the guide is pried open to stuff the cable harness in. Because the height is greater than the maximum Z height of the M2 (by definition, really), it has been split into two parts which overlap over the middle hole in the frame.

First remove any cable ties from the harness along the left side of the frame, then carefully pry open the guide and slip the harnesses into position. Then slide the assembly onto the frame. Bolt onto the frame using three (preferably) M4 x 12 machine screws with washers (M3 will also do, and I had some M3 x 12 screws left over from the printer kit supplies)