Most Roland TR-505 have the back panel missing due to the low quality glue used by Roland so I created a replacement panel. Use small amounts of hot glue and careful not to glue the top half because that part of the case has to be removable for servicing. For the best result place painters tape on to your glass plate (don't heat the bed) and this will give you a nice textured surface. I am working on another STL with raised lettering for the port labels.