I just assembled my new Anycubic Kobra 2, performed an auto level and tried to print the 30min benchy file they include on the micro SD card that it ships with. No other modifications of adjustments made. It printed in pretty much exactly the 30min the advertised.
It’s think it did OK, but with obvious issues. Since I’m new to the hobby I don’t know exactly what to expect and how to identify print quality issues.
My benchy looks like this:
OK so I did another ABL, and it seems like it doesn’t quite get it right unfortunately. This time I tried running the “levelling check” print they include (5 squares with 2 layers each, placed at the corners and center) and could actually hear the nozzle scraping against the bed when moving across it. I manually adjusted the Z-offset and that helped, I’ve now got readable letters on the bottom of my benchy. Blobs are still there though, so I’ll take a look at retraction as well.
Yeah, scraping is way too close. Also, if you are truly paranoid you could take a ruler to the surface of your build plate and make sure it’s actually flat. If it isn’t, that’ll cause you grief.
(The plate on my Qidi is removable, and held on with magnets. The other day I took it off to clean it, and by the time I reinstalled it a piece of swarf from something or other had fallen onto its mount, and got trapped under the plate which caused it to be bowed slightly. My next print came out with a bowed bottom and it definitely took me a moment to figure out why.)