This is a replacement ear piece for the Sony MDR V6 Studio Monitor Headphones. In addition I created an earpiece designed to house the main board from an ikross a2dp bluetooth transceiver... thus allowing for the hacking of these Headphones into bluetooth capable. Github is here: https://github.com/openfly/random/tree/master/openscad/sony-mdr-v6Print at 0.27 layer height with exterior supports. rotate so the acoustic chamber is facing the build platform. Should do the trick. Works for me at least. Right vs left earpieces basically just invert the offset in openscad for the holes in the acoustic chamber. I have not left a hole for the corded 1/8th in jack. This is by design. I am working on removing that necessity.