I'm using a bottomless portafilter for my Delonghi EC680 (similar to EC685), and it always annoyed me quite a bit, that the original cup holder has two holes where the coffee drips into, once the cups are removed, but now I only need one in the center, to avoid quite a mess.
So here is the cup holder with a single centered hole.
The author marked this model as their own original creation. Imported from Thingiverse.