This is a simple filament guide that slots into the standard Bondtech BMG mount for the CR-10S. This should presumably work with a CR-10 as well. You might need to do some light filing or sanding to get the parts to fit together. The roller uses a standard skateboard bearing. Feel free to comment with any feedback to help me make this design universally accessible. I designed this on two brain cells at 3 AM with no regard for anyone else but myself. Didn't see something like this available so I had to do it myself. I've included a link to the page containing all of Bondtech's STL files.
The bolt should print vertically.
The guide should print with the chamfer side down.
The roller should print on its side with the inner face of the cylinder facing upwards.
User preference (I used 0.6mm)
User preference (I used none)