Thanks for every answer so far.
The accuracy is not that much of a concern for us since the cut has to be finished by hand anyway. Basically at our university theres a small lab where one person works with carbon fiber. He coates the fiber as already discussed in this thread. Therefore he needs to cut the fibre with scissors by hand which is suboptimal because the scissors wear out quickly and the carbon irritates the skin.

I have to check which exact material we use but we ran a few tests and the rotatory blade had the best result.

Thanks a lor for the post with the postprocessors thats exactly what were looking for atm. Are there any other postprocessors which work with rotatory blades and how do they interact with mach3 and the triple beast? As far as i know we need an additional hardware for the beast in order to support that.