Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4410526.
I originally had robathome's Ender 3 Filament Guide(remix of Holspeed's filament guide) installed on my printer. When I upgraded to the 3DFused Linear rail kit I found that the guide would no longer fit due to the width of the spacers installed with the new rails. I downloaded the .stl file for the spacer off the 3DFused website and using Tinkercad opened up the space required on the bracket + a bit more to make sure it cleared the spacers if they expand during printing. The fit is pretty good if I say so myself. It does sit a little loose, but once the filament is run through it stays put (you could probably stick a piece of paper in to snug it up but I didn't find that it was needed).
Note: This is the bracket only. The rest of the parts are the same ones used in robathome's thing and can be downloaded there. https://www.thingiverse.com/thing:3061551