As said by many others: they really aren't taking cost into account. The cost free solution already exists in many domains, the one I'm most familiar with is ca

As said by many others: they really aren't taking cost into account. The cost free solution already exists in many domains, the one I'm most familiar with is canoe thwarts: http://www.noahsmarine.com/ucimages/yokes-lg.jpg http://www.noahsmarine.com/ucimages/yokes-lg.jpg. Figure out how to print something with this shape out of plastic and... well you have a hundred million pieces of plastic that you need to do something with now.