Printer Companies
Established and Start-up is relative in the 3D printing world, I had not heard of any of these before I got interested, but I am taking as a basis their presence within the 3D printing community.Established Brands/Companies:
Start-up Companies:
Content Aggregators
These are websites where people post some of the great content that they generate. Some are meant for a specific printer, while others are more open
(WORK IN PROGRESS...PLEASE FORGIVE MAJOR OMISSIONS AND NOTIFY ME IF THEY PERSIST)