This is NOT my model. This model is by Leafyon on Printables.

original model page can be found - https://www.printables.com/model/246828-nerf-trilogyshellstrike-shell/files

I just wanted to be able to print these directly from the app and the creator allows sharing with attribution. 

These shells work perfectly in a thrifted Trilogy that I picked up, and because they don't have vent holes they have more power than the stock shells.