This is a simple housing for the slimme meter simulator van Benefactus.nl - Ben's place. I use this gadget to send fake DSMR telegrams to a homebattery. Using these telegrams I am able to get the battery to do what I want instead of it doing it's own thing. All I lacked was a simple housing to protect the board and NodeMCU.

The stubs on the bottom of the housing hold onto the board to keep it fixed in place.

The lid should snap in place.

I have printed this in PLA, but any other sort of filament should be fine.