I made a little case for an Wemos D1 mini and a single slot relay.
The housing is completely closed except for the openings for USB and the relay. It is best to wire the relay first and then carefully push it into the housing. I used my own jumper cables to connect the Wemos to the relay. 10cm cable fit, but then it's pretty tight.
In order to print the overhangs and ridges cleanly, I printed the model with the relay opening lying on the ground.
The USB opening should be large enough to insert the Wemos no matter which direction you choose.
Have fun to print and enjoy :)
The author hasn't provided the model origin yet.