I picked up a second hand Nespresso Vertuo Plus which was missing the rear capsule catching container so I decided to print one!
My print bed is 210mm so it doesn't quite reach the top, but that's ok, capsules still fall in correctly.
I used 2 19x9x3.5mm magnets so that it attaches firmly to the back. I used a few dabs of super glue. I could have made it press fit but glue is easier :)
I would recommend a brim with no support needed.
The author marked this model as their own original creation.