3D printing scares me due to what it can achieve
a) Organ replication (Heart , Kidney, Lungs)
b) Body parts replications
c) Human body copies , including blood capillaries
d) Space Manufacturing plants to build space crafts in space with parts from 3D printer
3D printing , or even the "Vision" is so ... Alien in nature it just scares me to think how we have evolved from using tools from APE age to this "Technology" that many BSc folks can't even reconstruct in case of apocalypse , to replicate it , we might lose trade of actually building things with Human Hands
Just imagine you are 20 year old , you make a 3D scan of your body its saved into Super computers , and then years later as you age you come to time when you are 40 years old , that you would prefer your consciousness to be moved into a "fresh" new body
You would go into a facility hook yourself to a Super Computer , which would download your thoughts to temporary location and transfer your consciousness to wake up in new body when your thoughts are downloaded into new 20 year old body. The old body would be discarded