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:

• 1x 9.5 mm electret microphone capsule
• 1x 1uF-100uF capacitor. Polarized OK
• 1x AA battery

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.