This is a remix of wrodz's remix of Shii's filament guide for the original Prusa i3 mk2. The objective of this remix was to bring the guide directly above the crossbar in support of keeping the filament spool on rollers behind the printer instead of atop it.
I printed with the default 0.35 fast profile in Slic3r PE. I printed on it's side with the split part of the guide to the top. This didn't layer well, way too much of a cantilever there. I suggest printing with that side DOWN, OR print with supports in the main guide opening.
A light sanding around the opening of the filament guide is recommended to smooth out the path so that it doesn't scrape your filament on the way by. Also as with anything that's designed to snap onto the metal top of the printer, you'll want to trim away any excess that squished out from the first layer.
This was banged out in tinkercad in just a few minutes.