This is the case for the timed relay moduled that i will use to build my DIY spotwelder. I won't use the bottom part because i'll have a dedicated box on which i'll fix the module, nevertheless the case is potentially "standalone".
I've purchased the module on bangood, this case is for the 3-4_connections and not for the 3-3_connection (which is also more expensive). If you don't want to wait you can purchase the same module on Amazon.
It's easy to print, no need for supports or other settings. Also the material is not that relevant.
Ps: for safety reasons i've decided not to have exposed electrical screw terminals (220V could/will be quite dangerous) and you should keep the case like this. Anyway, if you need or want to have the capability to tight/loose the connections screws let me know and i'll modify the case.