What would you try next?

My guess would be that this one's wedged in there pretty good, and nothing short of tilting or opening the machine will get it out. But the temptation to solve the puzzle is hard to resist. A2 would surely bounce off, B2 will either slip by (it's somewhat compressible) or get stuck too, and B1 most likely doesn't have enough force behind it to push the wedged can over center.

Putting engineers and vending machines in the same place is just begging for this kind of analysis...