I got the new v6 nozzles and they print really good now (without drilling . I have printed a lot of different nylons, PLA and Ninjaflex, not had a coaster yet. But i still run with some retracts of around 5-10mm. But i am satisfied now. The UV colorchanging PLA E3D have is really cool, and very easy printable. So there WAS some bad design on the old nozzles.