In my continued efforts at producing a simple way of loading / unloading filament on the Prusa Multi Material Unit (MMU), the project now reaches version 7. Previous versions have concentrated on trying to control the filament as it loads and unloads. The Mk7 also incorporates a spool holder. The design allows for the filament to be smoothly loaded into the MMU and then it allows the filament to be unloaded in a controlled way.

I have included a version which doesn't use the spool holder if you simply want a filament buffer.

The size of the base and lid have been maximised for the size of my MK3 print bed.

The filament holder incorporates a cassette which allows for filament to be loaded easily. Once loaded the cassette can be stored inside the base and the lid closed.