Well this is not something I thought would happen. After having fired previous prototypes successfully, this prototype for our 3D printed Mac-11 blew up on only the 4th round.
A surprise, and an unwelcome one at that, but ultimately nothing major. None of the non-3D printed parts were broken or lost and on top of that I'm (obviously) uninjured. With this set back I dove right into modifying the design, and we should hopefully have a new prototype sometime towards the end of December.