Since I started using gray v4 I have never had a good impression. With gray v3 I never had any problems. I bought a new tank, cleaned the mirrors and it doesn’t improve anything. I spent a lot of money on a new tank without having to, spent almost an entire cartridge repeating jobs and testing every possible position with no result. People who aren’t complaining about V4 are probably not printing small, thin parts but only a blind person can’t see the various complaining topics about gray v4.