I wanted to have the funnel to lock onto the porta filter. I also wanted a 70 mm top opening (a little wider than the original model).
In PrusaSlicer 2.5.0: I needed to activate “External perimeters first” and change “Arachne” perimeter generator to “Classic” in order to get a smooth inner wall.
Other than that it is a simple print.
You don't need to activate supports as the support is part of the model. Simply break it of with a small flat head screw driver after printing finished.
Print in PETG with 0.4mm nozzle.
I chose 13% rectilinear infill, 4 perimeters and 5 top/bottom solid layers.
The author remixed this model.