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http://www.thingiverse.com/thing:3536321
Mini Speaker — Entirely 3D Printed by mattosx1984 is licensed under the Creative Commons - Attribution - Non-Commercial license.
http://creativecommons.org/licenses/by-nc/3.0/

# Summary

This isn't just a mass produced speaker in a 3D printed case, but instead the speaker itself that has been 3D printed. Over complexity has been avoided to make a fun, simple, and sturdy little speaker. When connected to an Arduino, it pushes out a decent amount of volume and sound quality for its size. It can also play regular music with a proper driver.

Materials List:

Very thin magnet wire, 30+++ gauge — the resistance of the coil should be around 10Ω
Six 6x32 half-inch machine screws, two 6x32 nuts
Three 3x12 mm neodymium magnets

For more information: https://www.instructables.com/id/An-Entirely-3D-Printed-Speaker/ 

https://www.youtube.com/watch?v=3VsehOYY73M