I caught the 3D printing bug. There were many reasons why I put this off too long (intimidation, time, laziness, etc.). All it took was one of my kids to ask, "Dad, can we get a 3D printer?" To which I responded, "I've been waiting my whole life for you to ask that question." Now we have several, and maybe we need some more filament. Which filament do you recommend, and for which applications?