The only 3D printers I know of that use actual wax are made by Solidscape. Their new 3Z Pro model goes for about $45k: 3ders.org - Solidscape launches high precision fully automated 3Z Pro 3D printer | 3D Printing news Of course, there are also some printers that use resins that will burn out, and you can also carve wax jewelry parts with a CNC mill for a lot less money.
Andrew Werby
www.computersculpture.com