After assembling the new MMU3 for the MK4 it seemed as if the arrangement with the MK4-enclosure has still been left to the creativity of the community ;-)
So I ended up with having the buffer fixed to the backside simply screwing it through the acryl at the spacers of the buffer.
To be able to access the buffer for insertion of new filaments, Ive added a door to the left side of the enclosure by simply splitting the original side acryl window and fixing it with the standard hinges which are also used for the front door.
The spool housing is made of 4mm Acryl.
The author marked this model as their own original creation.