I tried a roll on our HP260 in producing a lot of coro signs. Regardless of my profile, it always produced slightly bowed curved lines that were supposed to be straight. A hairline of 54" would be bowed in the middle about 1/8". I know its the heat in the profiles with the material, but I haven't been able to get it right. Any other material we use has no issues. (Signlab 9 user)