STOCK MMU2S - Filament # indicator!
Snap-on "cam-follower" design - flip in/out tag displaying the filament # in use.
Only one part needs to be replaced!
For the shaft I used one of the aluminum tube supplied with the MMU2S filament spool holder. If you do not have one you can print the one included or any dia 8.0mm x 120mm long shaft/pipe.
A video of the original made for the relocated CCA is available below, and describes how it works.
https://drive.google.com/file/d/1OHRWsKoJro-cdSMudLHA0WKjw2EXZvsD/view?usp=sharing
The author marked this model as their own original creation.