This model is CC-BY-SA with (c) 2011 by ewingate.
This is an STL from Thingiverse imported to Shapeways. A portafilter ring that you can push into your fullsize (rancilio silvia) portafilter basket while grinding coffee into it, to prevent spilling it allover the place.
6.7 w x
6.632 d x
2.638 w x
2.611 d x