Cable tidy clip for 20mm aluminum extrusion / 3D printers

Clip on wire management for Cr-10 / any printers with a 20mm x 20mm extrusion.

I also allowed a concave in the middle at the back to account for any T-molding so it will still sit flat.

Pro Tip. The clips are rigid initially. Put a screwdriver around the size of the hole in and angle it until it comes out the gap. This makes it easy to put in the wires.