Filament Guide to mount low on the MK3/MK4 Spool Holder

I originally made this because I thought the filament guide Prusa recently released didn't fit on the MK3 spool holders and that they had changed the MK4 spool holder for some reason. It turns out I was just trying to mount it lower than intended and that the original only fits between the ribbing at the top of the spool holder. Ultimately, this remix is still useful if you want to mount the filament guide lower down on the spool holder.

My original description is below:

It seems the MK4 has a different spool holder than previous printers. The filament guide Prusa released for the MK4 did not fit between the ribbing that was in my MK3 spool holder. I notched out the guide to fit my spool holder. 

The first one I cut by hand from the original that I had already printed. I have made the same changes to the model, but I have not yet reprinted it to ensure it fits without further modification. I will update once I've ensured the proper fit.