This is my own design for cable management.  I'm building a 3D printer using 2020 extrusion and with the quantity of cables moving it was not ideal to put it in the slot and use a slot cover.  This design allows for more cables than would fit in the normal slot.  Its designed to snap in place an hold tight.  I tested and it works on the slots on makerslide as well as standard 2020 extrusion.