I made these chicken feeders:
But rather than cutting a random piece of plastic, I designed and printed this.
I printed mine out of ABS so I could use standard plumbing ABS cement, but ASA would work as well. Other materials will work, but would require different cement.
Printing Tips:
Print however you'd like, but I would recommend using 4 perimeters so the “ring” of the reducer is solid.
The author marked this model as their own original creation.