Remixed the original Recto-Cube so that it has holes for the Micro:Bit buttons and a hole in the lid for outgoing cables.

Because you can't reach the buttons from outside of the box I also added separate buttons caps which fit into the notches around the button holes.

To prevent the Micro:Bit popping out when you press the buttons too hard, I used hot glue to fix it in place. A redesign of the box would be a more elegant solution, so I hope someone will remix my remix :-)

I use this box as a sleeping light for my kid. The Unicorn (not 3D printed but bought some place I can't remember) contains a small rgb led strip. The code for the Micro:Bit is here.