THis is a remix. I liked the idea of the MMU "Wallet" design. The Prusa cradles just took up too much desktop space.
You'll need to print 4 of MMU-support.stl.
I've included a drawing of the support. It's 1/2 plywood attached to a piece of 2x4. I wanted the weight so it wouldn't easily tip. I added another piece of 2x4 just below the supports to ad a bit of extra weight.
The left and right side retainers are held on with sheet metal screws through the keyhole openings. I just held it up to the plywood and marked the holes. They are not screwed down tightly. Loose enough to slide up to remove.
I cut the acrylic on a laser cutter and have included pdfs. You'll need 2 of acrylic1256.pdf. You really don't need to cut them out with a laser cutter, I had it available. The tabs on the left make it easier to remove individual "pages" when you remove the left retainer so are really optional. The right side has notches in the corners. You might like to do that since it gives you easier access to the filament.
The upper and lower supports hold the PTFE tubing and are also attached with sheet metal screws. I have them tightened them down once I had an angle that worked for me.
You can see with my setup, I've 7 filaments available. I have PTFE tubes attached for each and just swap the top tubes when using one of the extra filaments.
There's a video of it in action. The filament jumps aren't edits, just quick realignments the filaments made on their own.