مفت ویڈیو 3D Print Fully Functional Loudspeaker دیکھیں

the fully functioning loudspeaker, seamlessly integrates the plastic, conductive and magnetic parts, using only 3D printers.
to see the original designboom article, see here:
designboom.com/technology/cornell-researchers-3d-print-a-fully-functional-loudspeaker/