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@emanuvele Obviously an awesome design overall but perhaps one more mod can be incorporated into this. That is, a separate blade "cover". That way, you don't need to glue it or worry about it falling out. There are two different ones here: https://www.thingiverse.com/thing:3310038 and https://www.thingiverse.com/thing:3608229. I think the more flexibility this part can be printed with the better.

EDIT: Forgot to mention that @kmccon's great design also incorporates one: https://www.thingiverse.com/thing:3157550

Prusa MMU2 refined selector
De Luxe selector for prusa i3 mk3 MMU2s
by frimmel
PRUSA MMU2 Selector Improvements
by kmccon