This Side Mount MMU bracket hooks to the side of the PSU on MK3 or MK4. The nameplate wraps around the Z screw for clear visibility. 

1. Print the hook on its side. No supports needed. Screw the MMU and nameplate to it. Then hook it on the power supply case. Use zip ties to secure the bottom of the hook to the Z motor bracket.

2. Use a longer Bowden tube. The 650mm tube that came with the MMU is a good length. To change the length register, add the following to the Custom G-code in PrusaSlicer: 
     M708 A0x22 X650 ; Set Bowden tube length to 650mm

3. To increase the Buffer capacity, print an extra Plate Holder and place it in the interior corner of the buffer plates. (that forces the filament to bend inwards and fold.) Then wrap the buffer plates with black construction paper to contain the filament.