Luke's Hot End Fix - this is a modification you can perform to a standard Ender hot end. I have not done it myself, but have heard good things about it. This is a step by step video on how to perform that modification.
A direct link to Teaching Tech, a great place to see information about printers, reveiws, how to step by step videos, and other excellent content about 3d printing.
This is my collection of videos I made explaining certain topics. I add to this regularly. A lot of great info here on specific topics, and I take requests.