If you don''t know the meaning of "art" there is always that last resort, a dictionary
Miriam Webster on "art"
skill acquired by experience, study, or observation
<the art of making friends>??
?: an occupation requiring knowledge or skill??
.ideally operating an EBM machine should be more like using a stapler than playing a violin. The less skill required the less the labor costs and thus he cheaper the end product. Added in would be reliability, does the machine require constant fiddling and adjusting or is it plug and play. Also add in complexity in manufacturing of the EBM machines themselves. Using Tesla as an example their earlier (2012) cars cost more to build than the latest 2016 cars. And their newest model the Gen 3 will be designed from the beginning or ease of manufacture now that they no longer have to prove that electric cars drive great, are not only the equal of ICE cars but in my opinion (drive one) better.
