While there are very nice cases already available for the Wemos D1 Mini and Relay Shield, I needed something that would give me easy access to a few pins, including
...さらに表示 VCC and ground. I was also looking for a case that would snap together to close instead of the more common screw and nut approach.
I printed this with PLA and, while tolerances are tight, you get a very nice "snap" when closing the lid.
The reset button can be a little finicky to get in just right. Make sure the board does not crowd over the button before snapping the case shut.
Update 12/4/2017 - increased clearance for relay connectors on top cover.