If you have the feeling it is set to a very conservative value, try increasing it.The extruder motor moves in linear proportion to all the other motors, maintaining exactly the same acceleration profile and startstop points.But an extruder is not a linear system, so this approach leads, most obviously, to extra material being extruded at the end of each linear movement.
Even with the best tuning the corners are usually not sharp, but bleed out. The top solid infill displays roughness where the print direction changes on perimeters. These problems are minor or even imperceptible at low printing speeds, but they become more noticeable and problematic as print speeds increase. Tuning the flow can help, but this may lead to under-extrusion when starting new lines. G Code Version 7 Code And HasSome slicers include an option to end extrusion early in each move, but this adds more complexity to the G-code and has to be retuned for different temperatures and materials. Once Linear Advance is properly tuned, bleeding edges and rough solid infill should be nearly eliminated. Advantages Better dimensional precision due to reduced bleeding edges. Higher printing speeds are possible without any loss of print quality - as long as your extruder can handle the needed speed changes. Visible and tangible print quality is increased even at lower printing speeds. No need for high acceleration and jerk values to get sharp edges. Special notes for v1.5 Changelog K is now a meaningful value with the unit mm of filament compression needed per 1mms extrusion speed or mmmms. Load inside stepper ISR reduced as no calculations are needed there any more. Instead, the extruder runs at a fixed speed offset during pressure adjustment. LINADVANCE now respects hardware limitations set in Configuration.h, namely extruder jerk. If the pressure corrections require faster adjustments than allowed by extruder jerk limit, the acceleration for this print move is limited to a value which allows to use extruder jerk speed as the upper limit. The pressure adjustment moves dont lead to a rattling extruder as it was in v1.0: as the extruder is now running at a smooth speed instead of jerking between multiples of extruder print speed. New K value required As the unit of K has changed, you have to redo the K calibration procedure. While old v1 K values for PLA might be between 30-130, you can now expect K to be around 0.1-2.0. ![]() In v1.5, this is handled much smarter. LINADVANCE will now check if it can execute the advance steps as needed. If the needed extruder speed exceeds the extruder jerk limit, it will reduce the print acceleration for the line printed to a value which keeps the extruder speed within the limit. While you will most likely not run into this on direct drive printers with filaments like PLA, it will happen most likely on bowden printers as they need higher K values and therefore faster speed adaptions. If this happens to an amount you dont want to accept, you have the following options: Check your extruder jerk setting.
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