A train whistle made from scratch. While it has an air compressor fitting, it works fine by blowing into it. Parts can be press fit together or glued.

There are internal overhands in the base piece, but I designed it with internal supports that should allow it to print as long as you use good cooling and don't go too fast.

Creality

Ender 3

Doesn't Matter

No

Standard

100%

I engineered in some internal ribbing to deal with the roof of the part. It printed fine for me with the fan on 100%. The first bridged layer wasn't perfect, but subsequent layers smoothed out just fine.