I modded my MMU to the 12 filament MMU and then I put all of my spools inside the enclosure and i wanted a simple/smaller filament buffer to accommodate the lack of space so i created a simplified filament buffer for use within a Prusa enclosure. The mounting brackets have holes to match the hole spacing on the enclosure and are sized so that you can remove each buffer as necessary.  Each buffer can either be used with the buffer wheel on top or bottom to accommodate spools on the top or the bottom.  the top bracket is longer to create room to allow the buffer to slide in.  the wheel centers are sized to take 608 bearings.