Nerf Barrel Maker
thingiverse
If you want to make a nerf barrel but don't want to make measurements, just download this and edit it. The flat part on the side is the top of the barrel.
Download Model from thingiverse
With this file you will be able to print Nerf Barrel Maker with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Nerf Barrel Maker.