and that highly specialised design and medical knowledge, when...

and that highly specialised design and medical knowledge, when combined with 21st century cutting edge manufacturing technology, is going to prevent a significant barrier to entry to potential rivals. Once this takes off, the combination of ageing bodies and rich retirees, wanting to live longer and increase their quality of life, is going to make this one very, very profitable business. Think long term with 3DM. The future is here. Embrace it. Even better, order your new body parts now, if you are old and can afford them. Or young but disabled and can afford them.
All the above is my personal opinion. DYOR.