It looks like that carbon fiber is going to be some pretty tough stuff. I'm going to have to get some of this stuff and try it out. I really like your reusable folding spool. I will book mark this site. I'm wondering how hard would it be to do different colors in carbon fiber, or paint on it. I'm thinking any parts that you need that extra strength, that other plastics might not stand up to, would be ideal things to print with this.