NOTE: this Thing is designed for printing on a MakerBot (accomodating for shrinkage, overhang, etc). For a more up-to-date, non-MakerBot version, see:
A friction-fit cap for the bottom of the iPhone 4/5 that allows a stethoscope to be attached and recorded using the built-in microphone.
As the sound passes through the rubber stethoscope tubing, it is funneled directly to the mic at the bottom of the phone.
A quick test recording can be heard here:
Designed for the shrinkage of a MakerBot, this piece is printed in two pieces. Once finished, the two halves should be welded with plastic cement.
Prints well at 40% infill and 2 shells.