This acorn is cuttlefish cast from a wee acorn.
This is the cuttlefish the acorn and a wee key were cast in. The key was made from a watch key imprint with some adaptation to look like a lock key.
Dougie, who works for Imprints at the college, helped me take a 123d scan of my mussel shell half; he then made it into a mesh for 3d printing and printed it. My contribution is the etched piece it sits on.
This is it printing. I may be getting it in ceramic too, so that I can try different materials with the sound transducer.
This is the inside, showing a rather nice build up of layers, a bit like how a real mussel does it, but quicker.