Leaves by DJ Baja Blast published on 2024-02-10T20:09:00Z Created some 3D printed contact mics and here is a test. Printed in PETG, filled with epoxy. Includes a magnet for metal fun (see propane and cookie sheet example below) Everything is running through a DIY stereo pre-amp based on this design: http://www.richardmudhar.com/piezo-contact-microphone-hi-z-amplifier-low-noise-version/