Sonoff 5V/12V inching self-locking board enclosure
thingiverse
The USB mini power source opening isn't lined up properly, so some tweaks might be necessary to get it right. I picked up the board for $8 and change from eBay at https://ebay.us/OdG23S. Alternatively, you could check out this one https://ebay.us/BQDAN3. To use the design linked here, just pick the 1 that works best.
Download Model from thingiverse
With this file you will be able to print Sonoff 5V/12V inching self-locking board enclosure with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Sonoff 5V/12V inching self-locking board enclosure.