Fat Man (Kinda) potato cannon ammo

Originally designed several years ago in high school, and printed on my teachers 3d printer( honestly i have now idea how or what he had to do to get the school board to buy this thing for the class but it was amazing!) it was an into to engineering class CAD and what not. anyway this fits snugly into a 2 inch PVC SCH40 barrel for your potato cannon. I took the liberty of hollowing out the center and adding a hole at the top to fill with what ever payload or filler to add weight you desire! enjo