I was thrilled by Reven's Portafilter holder for Baratza Encore but I found my portafilter was too small, tweaked the design of the holder piece to fit it. Go get the other parts from their project!
The author remixed this model.
Decreased the gap on all sides to fit a slightly smaller portafilter. Added a tab on the back to keep the portafilter in place for hands free usage.