I remixed MK3S Reverse Bowden to fit PC4-M4 and added a ramp because I was using it with spool in front of printer.

Be warned that this must be printed in heat resistant filament as PLA will soften and fall off the frame and eventually strip. Also I did not notice for a couple of years but it does slightly interfere when printing near maximum Z. I was in the process of replacing(because I printed in PLA) when I decided to replace with different style.