Prusa MMU2S Filament Buffer Solution

My original problem was lack of space for my Mk2S and MMU2S so I had to come up with a wall mount bracket solution https://www.thingiverse.com/thing:3157502 I used this for a while with a flat filament buffer of the type Prusa eventually started to supply with the MMU2S but I was unhappy with it. Loading and unloading the filament was a major faff.

Then I found Graham Law's Prusa MMU2 filament rewind guide https://www.thingiverse.com/thing:3690758 and I redesigned that to suit my space available and my existing wall brackets. All kudos to Graham for the original brilliant idea, which involves using a spool as buffer for each individual filament

My solution is definitely over-engineered and some of the design choices were dictated by my existing brackets and the holes I already had in my wall.

I designed my own printable buffer spools and filament guides, and reworked Graham's PTFE bracket to suit.

Each filament feeds off the back of the roll, down through the fixed guide a