This is a case for a Wemos D1 Mini microcontroller board.
The case includes a few small cutouts for the micro-usb cable and 5v, ground, and DIN wires coming off the board, as these are the pinouts I use most often for custom LED strips. It also includes a small lever/button for the reset button on the D1 mini.
I've printed without supports fine, but the reset button may require them depending on your settings.
The D1 mini should fit snugly in the case with no need for adhesive.
The author hasn't provided the model origin yet.