10th October 2020 4:06 am
You aren't adjusting the correct setting. You should not adjust the nozzle B values. Those need to be set by the nozzle opening calibration and then left alone.
If your nozzles aren't closing properly, you need to open a support ticket.
Another possibility is that your model isn't made correctly and has a zero thickness plane right there and the printer is printing that because the model is telling it there should be something there. With the way the rest of the model is built and the fact that the two slots are obscured in the manner they are, I am leaning toward this as the cause a little more than a mechanical issue.
If you see excess material at the nozzle open or close points, you need to look at why that is happening. Is it due to a malfunction of the nozzle, which a support ticket can help you with, or is it due to the material and settings? You haven't mentioned the materials you are using so it is hard to tell what may be happening. I see a lot of warping, but the material looks glossy in the photo, so I am guessing this is PETG, but it is hard to tell. The material will affect how your print turns out.
A third option if you don't have a malfunctioning needle valve you have a problem with the filament movement or extruder so the nozzle pressure is building up too high and you get a surge of material at the start of the print, or the settings for the nozzle eject volume need to be adjusted. A support ticket will give you the best solution.