Wall mounted filament buffer MMU (based on MK8 mini buffer)

I loved the Idea of the MK8 mini filament buffer by Steveps3, but I needed a wall mounted mini filament buffer and did not need a spoolholder as I have just a PVC pipe rack for all my filament.
So I made a holder and made some changes to the cartridge and the wheel so I could mount the wheel vertically.
The complete assembly may be mounted upside down. There are 3.6 mm holes in the side for a M4 tap. If used it would keep the cartridge from falling out the holder.

There are also M3 prepared hole just above the holes where the PTFE tube can be pushed in. These should also be tapped.
If wanted the PTFE tube holes could be drilled and tapped to accommodate M5 and M6 pneumatic fittings for PTFE tubes.

They work very well!