This is a mounting holder for a 433Mhz RF Relay Board. Because the PCB has no mounting holes and the edges have components very close on all sides I made a special mount and back protector for this relay unit. It will work with the other frequency relays as well. I use 4 #4x 1/2" pan head Robertson screws to mount the whole thing to the wall or joyce. There are some different options, some with labels. (NC, S, NO, +, - )
iPRINT 3D, HATCHBOX, Tianse, etc. PLA, PVC, PETG
Grey but any colour is okay.
I used PLA with extruder temp at 220ºC, bed temp at 45ºC, and fan at 32% after the bottom layers are printed.