We use our gel blasters all the time and I was tired of dropping the gel ball ammo everywhere. They're tough to pick up and they bounce like crazy too!

I designed this funnel to fit into the opening of the common, clear grenade looking hoppers. It should drop right into the opening, but with a tight enough tolerance that you don't have to hold or support it during filling.

You'll still need to pour in a controlled, moderate manner. Since the gel balls bounce so easily, they will bounce out of the funnel if you pour them too quickly. I included a small inner lip that helps redirect stray balls back into the funnel, but with a controlled, moderate pour you won't lose any.

Should be an easy print on pretty much any printer. Designed for 0.42mm perimeters, no support, inner and/or outer brim, although it generally will print fine without it.