What 3D Printers Are Good For

A lot of times I'm asked what 3D printers are good for, as in, why would someone want a 3D printer besides the cool factor. Xnaron on YouTube posted a project update for an antenna tracker, his own creation, and all the structural components for the machine are printed on his RepRap. There's a lot of innovation going on here, and 3D printers enable makers to make more complex and intricate designs than they might otherwise be able to fabricate.