Distribution Board / Breaker Panel Mounting Frame
thingiverse
I include a blank mounting template you can edit in Meshmixer or Fusion 360 to fit your own custom switch, fuse mounting, meter etc as well as my version for my specific switch and fuse. These should clip into a ~36mm rail in the box and stick through a 45mm high opening. The width is 36mm once folded. Prints flat so it's an easy and quick print. Afterwards you will need to use a heat gun or lighter to heat each of the thinner "hinge" sections and then fold the sides 90 degrees.
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