My 3D printer is running really well finally and want to make molds for carbon Fiber projects. Looking for advice on prepreg or wet layup processing or maybe something that i am missing.
Are you intending on making 3D printed molds or would you be wanting to make plugs that you could pull fiberglass molds from?
I ask because the biggest question here is temperature required.
If you go with a pre-preg you are going to need a 3D printing material that can take repeated and sustained elevated temperatures. Many at home 3D printers utilize PLA and ABS. PLA has a glass transition temperature of around 145 F and ABS has a glass transition temperature around 205 F. Both of these plastics would not be good materials to print straight to mold for pre-preg applications since pre-preg typically gets processed above 250 F.
PLA and ABS would be good for wet lay-ups but they need to be sealed and released before hand so that you end up with a mold that can make a couple parts.