Today 3D printing is put in action for medical use as equipment and human organs, as well automobile parts, fashion, architecture, demonstration purposes etc. Engineering departments of big manufacturing factories like those of Boeing and Mercedes have spared millions of dollars with utilization of this technology. Although this process has been initially invented by Stratasys founder almost 30 years ago, only these few years we see more massive use. One maybe most important use of 3D printers is within medical science and bio printing/organ printing.
Saving lives is by all means noble characteristic and now more lives can be saved for patients will not wait for donor organs. This medical process involves printing entire human parts or whole kidneys.
Another use can be in printing lung supporting tube for patients with problems with respiratory system. This 3D printed splint has saved lives and it can be designed and shared on internet for download by other hospitals.
Automotive industry is loyal consumer of latest 3D printing technology. For example GM used SLA technology for resigning parts for their Malibu Chevrolet last year (2014). GM is using 3D printed parts for various parts as front panels and inside panels adjusted for specific navigation systems and mobile phone holders.
Renault uses 3D printing for brakes parts, cylinder heads, headlights etc.
Some auto-maker companies do make whole concept cars. Urbee is one example, at which whole body was 3D printed. Urbee 2 has much improvements and its appearance will be more refined.
Aerospace industry as NASA does use 3D printers and it will provide its astronauts with 3D printers on space missions. By doing this they will not be carrying spare parts with them.
Medical departments are printing prosthetics for their patients. Legs, hands are printed as well jaws and fingers for patients born with deficiencies or injured in accidents. Prosthetics are printed for animals and for fossils to mimic body parts of their skeleton.