Here is new 3d printed speaker project where the membrane is also 3d printed. It was designed to be printed on resin based machines.
It was developed by madaeon who is also working on LumiPocket resin printer.
It goes without saying that you will need some wire and magnets to get some sound out :-)
All the files for the speaker can be found at: http://www.thingiverse.com/thing:523581
Detailed instructions can be found at: