13mm Sledgfire Single Shell

Just tossed the original into tinkerCAD, plugged the hole, and put a new 13mm diameter one instead, as I found the original wasn't tight enough for my taste. (some darts were even falling out of the original)

Of course I mistakenly started from 12mm, and eventually found that 13mm provided the results I wanted (able to rear-load without issue for E-kind/Adventure Force waffle darts and sticky darts, compression on older, crummier darts) with only a couple quirks (elite darts, (modern)sticky darts, waffle heads, and short darts all work and are rear-loadable, but some dart styles, incl. buzz bee long distance, old-school nerf sticky, whistler, buzzbee stickies, xshot, etc can only be front loaded)

I'm including the 12.9mm variant I went through as that one also works, though is a little harsher on rear-loading darts, as I don't know how well-calibrated my printer is, I'd recommend trying both and seeing which works better for your use case.

**ALSO: I'd recommend you print thes