thingiverse
This is a junction box lid for a common 110mm x 110mm electrical box.
I gave made this to mount 3 switches at my workbench to run LED lights at my bench and printers.
The Switches are generic 37mm x 21mm rectangle ones.
https://i.ebayimg.com/images/g/6BIAAOSw9cVfBM0e/s-l300.png
The Junction box also has room for as realy such as this one:
https://www.jaycar.com.au/arduino-compatible-4-channel-12v-relay-module/p/XC4440
Direct link to the original creator's page
Click the "View on thingiverse" button above to visit the original model page on thingiverse. You can download the STL file directly from the creator's page for free.
This STL file is compatible with most FDM 3D printers (Creality Ender 3, Prusa MK3S+, Bambu Lab, etc.) and resin printers (Elegoo, Anycubic). Check the original page for recommended print settings and materials.
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Most STL files can be modified using free software like Blender, TinkerCAD, or Meshmixer. Check the license on the original thingiverse page to see if modifications are permitted by the creator.