This is a controller shaped case for the BBC Microbit with a detachable battery holder that fits the standard 2xAAA (JST-PH) battery pack for the Microbit. The original design for the controller case was done by Guillermo Melantoni (@melton3d). I modified it to fit the Microbit more easily and added a detachable battery pack holder the attaches with a dovetail mount.
I printed the controller case with 20% infill with supports and oriented flat with the dovetail on the bottom. I printed the battery enclosure vertically on its side with 20% infill and supports and with the cutout for the power switch facing up.
The author hasn't provided the model origin yet.