Simply put its a TPU base that can be printed and slipped onto the bottom his the tamping station. The idea it to give the base more traction when compressing grinds and also be gentler on working surfaces.
I'll also Add the CAD file in case anyone would like to iterate the model for the better.
The author remixed this model.
Its not actually a remix of but an accessory for Demek's tamping station and does use his model in the Design/CAD'ing Process.