...because they're for the birds.
There's now a group called Animal Avengers who make 3D printed prosthetics for animals. Including replacement beaks. They've even been able to release birds into the wild with their prosthetics, made of biodegradable plastic.
3-D printing has also now been used to make custom horseshoes for injured/foundered horses, tortoise shells, replacement joints for dogs and cats and, of course, straight up prosthetics. Because 3D printing is so much cheaper, it's worth doing it for critters.
The racing industry is now looking into 3D printing horseshoes as a routine thing, at least at the higher end, as the 3D printed titanium shoes are even lighter than aluminum racing plates.
But a goose with a new beak getting to fly free? That's awesome.