The file '5 String Banjo Mute 3D Printer Model' is (STL) file type, size is 2.7KB.
5 String Banjo Mute
I printed this with PLA and 20% infill,
For the foam I used small adhesive window insulation, it measures 6.4mm wide by 3.2mm thick and comes in a roll (I found it at ACE Hardware).