Addendum;
I have virtually the same 3D pen. This guy is leaving out so many many step. I would say had probably had close to 20 to 30 hours sanding that body. If he had put plastic strips on the formers, he could have laid the body top with thin Fiberglass matt, and then popped out the formers, Minimal sanding. He could then turn that body into a plug, and that could be used too spray in a coat of Gelcoat, and then lay down the fiberglass inside the mold he has created, which he would then make 100's of these cars out of. (You must always use a release agent)
I abandoned using my 3D pens as the insert strips are very expensive for qualiy strips and really get used up fast. This is essentially a 3D hand held printer. That being said, I have seen masterful works, such as this one made. These people are sculptors in reverse. They are building up instead of chipping away.
It takes many many hours though, I sincerely believe the use of these on certain models could enhance them. I tried to make a simple motorcycle frame. I own the real motorcycle, so dimensions weren't an issue. Trying to get a straight line was though. You could go to a hobby shop and buy plastic rod, bent it by hold it between your fingers, or if you cold blooded, over a candle frame, and pop out a frame in an hour or so. A nice set of machnnists files for the ends, you're good to go. You would have a very strong model.
If you buy one of these pens, only till you carefully read the instructions, get the heat and flow rate right (and that changes for every part you are making), then you will know if it is for you. They have come down in price, and there are many reviews on them. I got mine when they just came out, and the reviews were great, but not accurate. I don't think I have the patience, and know to many other techniques to achieve similar results. That's my bad. Too old, nd not great at learning, and my hands aren't rock solid anymore. Any trembling, forgetaboutit.
I do have a vast knowledge base, and can tear apart almost any Vintage (1980 and earlier) Mercedes, and M.G. engine, some Lycoming and Continental aircraft engines, weld in body patch panels, replace aircraft skin panels, but the 3D printing gun would have to be the size of a JackHammer to help me out of that, and I did all my repairs in the same gauge steel, so their goes that idea. Just a rant. Anything with aircraft, unless it's a D.I.Y. plane you built, has to be repaired under the tutelage of an A&P, and then inspected by a A.I.. That's so expensive, you mine as well have them do the job.
