1. Both 3D printing and CNC are limited in my opinion, (having taught masters students on the subject) it is the job of designers to test those limits, but many

1. Both 3D printing and CNC are limited in my opinion, (having taught masters students on the subject) it is the job of designers to test those limits, but many things can be done in CNC machining that 3D printing is not capable of and vice versa. Example this chair I just made (designed by Phil Seaton.) http://www.fabsie.com/blog/2012/03/04/scissor-chair-phil-seaton/ http://www.fabsie.com/blog/2012/03/04/scissor-chair-phil-sea... 2. Tooling cost of switching tools is only zero because you on about using one tool to 3D print. Could speak about various aperatures of tools of 3D printing various types of plastic to chocolate to ceramic. The main reason you change tool sizes is to increase speed, i.e. bigger router bits cut faster and you don't want to spend 3 hours to do something with a 3mm bit that can be done in 12.5 minutes with a 20mm bit. (opportunity for 3D printing to grow. 3. CAD Software is ubiquitous.