In my opinion (layman) there are two possible causes:
-Overextrusion at the beginning of the perimeter
-Oozing during the wipe
What is very strange: If use the same slicer profile for a perimeter part (which I used for tuning the seam parameter (seamgap etc.) there is no visible seam…
PA is tuned and set to 0.04
So I am kind of clueless and hope you can point me in the right direction.
(Left side my seam settings - right side “normal” seam without wipe. As you can see, there is still too much material at the beginning of ther perimeter. This leads me to believe, that there is overextrusion at the perimeter beginning. Do you agree? If so, what can I do about it?
thank you for your quick reply. I can see, that it will never completely be invisible. However, I believe that there is something else behind my large blobs.
I was talking to somebody else who currently has similar problems and he suspects the gap infill to be causing this (or at least be related).
When I print a two perimeter part, the seams are almost invisible.
I could also imagine, that it is retraction related, but my speeds (35mm/s retract/detract) are within the limits of my extruder…
@Mikey too slow or too fast of a retraction speed could also cause some differences.
I believe in Prusa Slicer, the default PLA retraction speed for a MK3 style printer is 45mm/s.
I have an 85mm long Bowden extruders and still find 45mm/s a good speed. I’ve played with slower speeds and seeing oozing and part melting (due to hot end lingering). Faster speeds I’ve seen gaps in extrusion.
I’d suggest bumping up your speed in 5mm/s increments to see if you get better results.
Unfortunately, the 45mm/s I use currently are the limit of the LGX that I am using (according to the manufacturer). I will try anyway, but have little hope that I can increase it.
@Mikey,
I’ve been playing a bit with my CoreXY lately and here is some things that I have figured out: The higher the PA, the less retraction distance you need.
I also looked into your extruder and here is some recommendations:
retraction speed : 35 mm/s
retraction distance (bowden) : ~5 mm (0.4 + tube length[mm] x 0.015)
retraction distance (direct drive) for rigid materials : 0.4 mm
retraction distance (direct drive) for soft materials : 3 mm
Are you using in a “direct drive” or Bowden?
Typically, Direct Drive does not need much PA and also not much retraction. Bowden needs more PA, but less than the typical ~5mm retraction.
I have an 850mm Bowden Tube, my PA for one extruder is 0.68 for PLA, and I’m using a 1.8mm retraction. For me, the longer retraction caused not enough filament on the start corner.
