Case for one of the most affordable Bluetooth receiver boards. 

The case has space for the board itself, 13300 battery (commonly found in single-use e-cigarettes) and optional custom USB-C conversion board.

Features three compliant buttons and ON/OFF slider, whole case is held closed by single screw that comes with original case (any other 1.7-2mm diameter, 5mm-20mm length screw should work) .

Printing button part in PET-G recommended for best button action. (I used Zadar PETG LIGHT black, the rest is Zadar PLA LIGHT White)