First layer issues on travel
Hi, I’ve been printing fine on a 0.4mm nozzle and also switching to 0.6mm has been great. Now I’ve moved to a 0.3mm nozzle however I’ve got issues on my first layer when the print head finishes a perimeter and moves to the next it’s not clean. I’ve tried lower/higher temps, different z offsets and configured the pressure advance. Not sure what to try next, could this be retraction related? Extrusion multiplier? Bit lost, any suggestions appreciated!
8 Replies
I’m case it’s not clear from the video the issue is the blob that seems to be left at the start/end of a new perimeter. All line widths are relative, I think I’m running at 115% and first layer 0.18mm with other layers 0.1mm. I’m printing PETG with a heated bed.
Have you tuned pressure advance?
Yep that’s the only tuning I’ve done on swapping the nozzle though; that’s all I had to do when I went from 0.4 to 0.6 too
Did you set 0.3 nozzle size in printer.cfg?
Looks to be massively overextruding? Maybe some slicer settings are still thinking 0.4 or 0.6 nozzle?
I set it in the slicer not in printer.cfg- didn’t think it would be an option there but I’ll take a look. I’ve given up on the 0.3 nozzle and put a 0.4 back in and it works perfectly. Really frustrating! Especially since the 0.6 nozzle worked fine
Pressure advance calculations use the nozzle size in printer.cfg - you'll want that to be consistent with whatever nozzle size you are running when doing PA tuning.
Hmm I can see nozzle diameter in my printer.cnf- didn’t know that was there. That being said it also has pressure advance in there but it’s using the PA I specify in my slicer filament gcode… seems weird to have to configure the nozzle in firmware as well as the slicer 😕
Yeah, it's a pain as I often forget myself but it does have an impact... Sometimes it's subtle and sometimes obvious... In my experience, petg has a pretty narrow window when it comes to settings and having anything less than 'just right' can make for some awful prints... Did you figure anything out here?