@doitvoluntarily that is a perfect read for me at the moment. I have just been to a fare, which took place parallel to the Blockchain expo, where I got a tour through the possibilities of 3D printing. This was mind blowing!

I took this photo:

Printed with the help of free open source instructions. Cost point: 20 Euro for the material! 20 Euro that can change a person's/kid's life tremendously in countries with a lacking health insurance. Just stunning!

Since then I am overwhelmed by this topic.