Ignoring the non medical DEKA products (Segway) I think DEKA and FIRST (particularly FIRST) should have much more PR. Maybe you could argue ambition, but I still feel like mentioning these two organizations.
I know you are talking about hobby/consumer level printing here but it is entirely possible to print things other than little plastic junk. Metal SLS printing is very capable today.[1] Printing materials such as tungsten would make a very capable (however impractically expensive) bullet.
Regarding so much innovation from one man, his company DEKA has a few hundred engineers.