V-Slot Rail Insert

thingiverse

This design fits flawlessly within V-slot rails, similar to those used on an Ender 3, by example. The insert won't obstruct rollers in any way. You can easily customize it for tasks such as mounting LED strips or cables inside your 3D printer's rail. Simply edit the design to suit your specific needs. The wider surface of the insert faces outwards from the rail, while the narrower surface is positioned inside. No scaling should be necessary, as it fits snugly. If a tighter fit is desired, simply scale up the entire part slightly.