I very nearly gave up on 3d printing because of the Magma Hot end. It never jammed completely, it always printed like it was partially jammed and didn't feed enough. I just thought it was that hard to make a print and it was that tricky to do. Finally I thought it must be my hot end and ordered an E3D. Best decision. Smooth sailing ever since. The only thing I've never really figured out well is bridging.