I have been tinkering with burners for a number of years now, but the hard part was making the burners to test the ideas. In burners 101, John in Oly, WA had posted about some of his experiments in the vortex burner range. His experiments were created in part with a 3D printer. Seeing what he had done, I had a mind blown epiphany about 3D printers and prototyping. I knew almost nothing about them at the time. I learned about 3D printers and purchased one. I then had to learn about their i