The file 'Relay Case Rail Mount Hackjob 3D Printer Model' is (stl) file type, size is 162.4KB.
Quick hackjob to attach the relay board directly to the printer, also shortened the lid slightly to make sure it fit with the added rail.
Print both pieces with their largest face down, make sure you have supports on everywhere. I didn't have any issues with it sliding on the rail.
Case_With_Rail_Mount.stl | 283.5KB | |
Top_Cut_Short.stl | 292.8KB |