Summary This thing mounts to the side of the control box and provides a place to zip tie the USB cord so it doesn't get pulled out while printing. You can use the original screws to mount. There is also a square shaped "wing" that is designed to nest along the front side of the left Z column. When pushed up in this position it holds the filament spool in the correct location. This is for the original control box so I don't know if any changes to the hole pattern have been made with newer boxes. If you have your control box on the right side of the printer you should be able to mirror the model and use it on the other side of the box assuming the hole pattern is symmetrical. Route the USB cable thru the notch near the square "wing" part and then lay it into the bevel at the back of the part so you can push your control box over to touch the printer without the cord interfering.