bobtato

Thanks for the extensive reply! It is a 0.6mm nozzle, yes – it's the one supplied with the printer, and had never been used. In fact I thought it might have some kind of debris from the factory, so an "atomic pull" was the first thing I tried. The filament came out with the same shape as usual, but it didn't help. I also tried a known-good spool of a different PLA material, with the same outcome. The feeder is definitely pulling hard enough, and I opened it up to make sure it's not worn or full of debris. All the fans are running, and the Bowden tube is in OK-ish condition. Printing at half speed mostly fixes the problem, but makes the 0.6mm nozzle pointless. 225% flow rate works even better, and the filament isn't noticeably chewed afterwards, but that doesn't fill me with confidence. It's confusing either way. Why would Ultimaker put a 0.6mm (and 0.8mm!) nozzle in the box, if the printer can't use it and their default settings are wrong anyway? Obviously something is not working the way it's supposed to. I don't mind ordering a new isolator, as that's probably overdue, but I'm skeptical that will magically fix the problem. Right now I'm thinking the answer is to switch back to 0.4mm...

I am having the same problem with Cura 5.2.1, an Ultimaker 2+, and the Ultimaker-supplied 0.6mm nozzle. Layer adhesion seems fine, but the line width is clearly too narrow – I get the same kind of waffle effect described above. I do seem to be able to mitigate it by cranking up the flow rate in Cura (> 150%), but I feel like that's going to cause other problems (?), and without knowing what's going on, I don't know exactly what the nominal value should be. Looking at the G code, lines are correctly spaced (0.55mm apart) in both the top and bottom skins. hgs.3mf