Precision is precious

This article3D PRINTING AND LEGOS:PERFECT TOGETHERis a great example of an engineering principle that says that you should only be precise where precision is necessary. Unnecessary precision is a waste of time, money, and resources. The article shows a prototype of a pair of goggles, where precision is needed for the areas holding the lenses. So they used a combination of the Legos (cheap, easy to work with, and abundant – but not easily modified) and 3D printed pieces (takes longer to make e...