I printed it with generic PETG 0.2mm layer height. Printing upside down (threads facing bed) does not need supports.
Dimensions
Height: 23 mm
Spacing between tabs: 23.5 mm
The author remixed this model.
Base that is perfectly fitting the GC evo portafilter. The tolerances are tighter, total height is 23mm, the 2 gaps for portafilter tabs are around 23.5mm wide. Fits my portafilter with IMS basket almost perfectly.