When should you upgrade the nozzle in your 3d printer?

I've heard a lot of different reasons from a lot of different people on why brass nozzles wear down and what the best ways are to keep that from happening. In this video, I detail what I know, and I invite corrections to any information I may have incorrect. E3D Hardened Nozzles: http://printedsolid.com/products/e3dhardenednozzle?aff=2 Micro-Swiss Plated Nozzles: http://store.micro-swiss.com/collections/all "Why You NEED a Hard Nozzle! Filaments & Nozzles Under the Microscope" from The Hot End: https://youtu.be/vVquEtmekDw?t=4m22s Affiliate Links: == Patreon: http://3d.pn/patreon == 3D Printing Nerd shirt! http://3d.pn/shirt == Printed Solid: http://3d.pn/printedsolid == Matterhackers: http://3d.pn/matterhackers == Amazon US: http://amazon.3dprintingnerd.net == Amazon Canada: http://amazonca.3dprintingnerd.net == Amazon UK: http://amazoncouk.3dprintingnerd.net