I bought my cable chains from amazon: http://www.amazon.com/gp/product/B00880AVL2?psc=1&redirect=true&ref_=oh_aui_detailpage_o08_s00
They are 10x15mm inside and work fine for the control cables. I don’t run the main power for the router through it. I will probably run some power wires to the z axis for the foam cutter and laser I’m adding. I expect they will fit just fine.