Upright Piano, Dollhouse Scale
My grandson wanted a piano for his dollhouse so I found this one over on printables (https://www.printables.com/en/model/591620-vertical-piano/remixes).
It was too small, however, so I upsized it to scale (1" = 1'), made the white keys a separate part that could be printed in color, and made a simple two part bench.
Now if I can just train a chipmunk to sing and mime piano playing I will be all set!