The Hovalin, A functional acoustic violin by Hova Labs that can be produced using most standard consumer 3d printers.

Here’s a modular fiddle from OpenLabPDX.

From their website, “The Modular Fiddle makes a great casual violin. It’s loud enough to hold its own in any acoustic jam, so take it camping, spill beer on it, and don’t worry about the varnish. Every part of the 3D printed Modular Fiddle is easily replaceable – and replacing parts and upgrading your instrument doesn’t require the skills or tools of a violin maker.”