I would use mine to do plastic repair type work on printed models. Even though I have a 3d pen and haven't actually used it yet. I know, I'm so bad. lol I have say, what I'm really looking for on these is more temperature control, to expand out in materials that can be used, or just to fine tune the temp to the ones I am using. I fined it hard to believe one temp fits all. Anyway, cool site. I like the fact you send plenty of practice material with your product. I will bookmark your site to keep up on the progress of your 3d pen. Have a nice day.