Various methods of managing cables
Cable Ties Also known as "Zip Ties", good for initially grouping bunches of cables together, or to secure the cables to the frame.
Heat Shrink Tubing Works well if you can get it over all the connector ends
Braided Cable A expanding mesh tube that keep cables together, needs securing at each end.
Spiral Wrap Cheap and effective method of bundling cables together.
Extrusion Channel If you are using extruded aluminium you can run some of the cables along the unused channels, secured with clip in covers.
Electrical Tape Taping cables together in bundles works, but can be awkward to remove if you need to make a change later.
Cable Carriers Also known as "Drag Chains", a segmented enclosure for cables that flexes with the movement of the machine, can be 3D printed.