A Reddit post explains that you can 3D print a cold air intake system that will make your car engine, in this case a Mazda Miata, more powerful by sucking cooler air into the combustion chamber. People routinely look for "aftermarket systems" to increase their car's original engine power, and this option is designed by Alec Moody and 3D printed most recently by Reddit user "TheRealSpaceTrout" in ABS using acetone vapor bath and XTC 3D coating. This cold air intake system is reportedly a more affordable and easier to install option than many other engine modifications available. Read more at 3DPrint.com: http://3dprint.com/122795/mazda-cold-air-intake/ ‎