Ender 3 Rail insert

thingiverse

I designed a model of the insert for the Rails on my Ender 3 Pro printer using the same printer. I can make adjustments to fit more snugly if requested. You can modify this design to any length you need in your preferred software. Simply rotate it as needed to eliminate supports, assuming you're printing just to test the fit. Depending on how and what you use it for, you may still require supports. This insert is a starting point for making your own custom parts.