Project homepage Demo video on Youtube Has body diameter of 20.5 mm (13/16 inch), same as many commercial elecret/measurement microphones. For compatibility with accessories etc. Vitamins required: For usage, hook up with jack cable (6.3mm 1/8inch) to a mixer/recorder/sound-card with preamp. Future versions might include an integrated pre-amp circuit. Suitable mic capsule Designed for printing with ProtoPasta Conductive PLA. Dual-extrusion not required. Will probably work with filaments with less resistance as well. Alternatively, one could use single-core copper conductors ~1.5mm diameter put into the channels manually (soldered to components). Would need to replace the thinnest trace in the top with a 1k-3.3k Ohm resitor, and probably tweak the springs for the jack socket.Print parts with traces in name in conductive PLA.