I am pretty familiar with 3D printing, use it for work, and yes it's perfect for RC. In 10 years you may have a printer in your home that will allow you to download and print parts for your RC cars. Paypal, print, install.
Look at DDD.
http://www.3dsystems.com/ Home systems have already fallen in price, lower than some of your RC vehicles.
http://cubify.com/cube/ Prints in ABS plastic also.
Printer prices are going to fall quickly as the market develops around it. I just hope they can keep cartridge costs under control.