This is an alternate design for the bottom link of the cable chain designed by lRobertl found here: https://www.youmagine.com/designs/ultimaker2-cable-chainI wanted the end of the chain to hold itself firmly in place, but still without drilling holes in the floor of the Ultimaker for screws. The notch at the end of this link fits into the hole that the cable passes through and is held in place by the flex of the plastic.