The part was a "plastic air induction elbow", i.e. this kind of thing:

https://duckduckgo.com/?q=plastic+air+induction+elbow&ia=ima...

so, if you were thinking "who would use a 3D-printed part", remember that it may otherwise also have been made with some liquid material, but using a mold, and perhaps two parts using a mold that are joined with re-heating etc. - and now it no longer sounds so outlandish.