I've been a fan of the CONCEPT of 3D pens for some time. In fact, I own one. But, my excitement was shortlived when it became hopelessly clogged. I thought the solution would be a better extruder; but, I think I was wrong.It turns out that the real solution may be to drop the heated plastic altogether in favor of using photopolymer "ink" that is solidified using UV light! It's safer for young children, the very population for which I envisioned using a 3D pen. And, I THINK that clogging will be a thing of the...