After printing the micro whistle by Charles, I immediately wanted to add it to my 3d charm bracelet.  I just bought a spool of silver filament and will be testing it with this model.  Thanks Charles.

I almost forgot.  I stuck my craft knife in to release the pea.  Sometimes you have to give it a tiny little twist.  It gets louder with the pea released.  (You have been warned--just in case you plan to give this to someone who is in touch with their inner child.)