Nerf Absolvers - 3, 4 and 7 shots

These are shotgun absolvers for Nerf darts. They take any 5/8" OD barrel in the front, such as [1/2" ID polycarbonate](https://www.amazon.com/Polycarbonate-Tubing-Wall-Clear-Color/dp/B0019400XS/?tag=tv-auto-20), 0.509" ID Aluminum or PETG, or CPVC. I have found that loose barrels like 0.527" ID aluminum do not work well in absolvers. The back side connects to a stub of 1/2" PVC on any blaster. Depending on your printer, you may need to tweak the barrel sizes in Fusion 360. And if your printer ha