I printed an enclosure for a few sensors that fit into a 1 gang slot (I basically copied the dimensions of a TP-Link switch), including the AC/DC converter. The thing is only drawing a watt or two, so I'm not super concerned about it shorting out. But, I probably need to use a UL certified power supply.

But, that particular project is tabled until I can finish converting an old oven into a heated build chamber to print with fire resistant polycarbonate.