4-piece sausage stuffing horn pusher. I made this to clear my set of sausage horns after stuffing into casings. The end caps measure just under the diameter of the set of horns that I own - 10mm, 13.5mm, 17.5mm, 21.5mm.
Only the two handle halves need to be glued - that way everything can be stored in a more compact fashion and easier cleaning.
You can either print two small pins, but I used 1.6mm (width) brad nails cut to 14mm long for strength, then glued using super glue.
When looking at the STLs, the inside cylinders are negative space to allow the rod to connect to the end caps.
The author hasn't provided the model origin yet.