Just installed Marlin 1.1.8 bugfix on thursday on my MeCreator 2.
I did enable Linear Advance, and did some test patterns. Getting adhesion at 60mm/s is not always easy. So something with slower first layers, and then stacking lines would maybe be an improvement. I think I got best results around K=120+ (Bowden setup). Is there better test patterns, not at layer 1 ?
But in real life printing, even K=50 gives underextrusion, and above K=50 I actually see retracts, and lots of extruder action going back and forth. Did not expect retracts to be part of this. Only pressure build in relation to acceleration, and decrease pressure during deceleration.
I run 1000 e-steps/mm (will likely decrease to 500 to ensure I will always be able to handle it within 1 ISR) on a geared extruder, so the micro retracts are very visible.
Is linear advance supposed to do retracts ?
