This is a quick protective shell I threw together to protect the Bittboy V2 - this may work with the V3 but I do not have one to be able to confirm!

Depending on print settings, this may be tight to fit together - I printed at a low resolution and needed to sand to get a good close.

I've included two lids; one with the Bittboy logo and one without. The one without prints more reliably on my Ender 3, the one with had some stringing issues.