Wanted a pocked-sized setup for Micro:bit so I could use it on the go, and had a little 10x17 breadboard, so drew up this holder for it. Used a Pimoroni pin:bit to connect the Micro:bit to the breadboard, and the Micro:bit itself is in a powered case, so it's a ready to go setup. Has a space underneath for holding some jumper wires.

Attached the pin:bit to the holder with a pair of M2x5 self tapping screws. The holes aren't perfectly lined up, but it works. Double sided tape or even blue tack would work too.

Pin:bit can be found at https://wecl-stem.com/shop/058-33-7941/ The battery case can be found at https://wecl-stem.com/shop/058-33-8521/