Seems to be quite a workout for slicer. There is some sort of weird artifact in one of the fins possibly or the retract is off on my printer. As far as I can tell everything looks fine though. Sketchup file included if you want to mess with it. Friction fits onto the canister. I guess you could paint a dartboard on a chunk of drywall and whip them at it..... where did I put that cannon fuse?...hmmmm....