Linear advance is a firmware feature that controls the timing of the extruder separate to the other axes, with a focus on managing pressure inside the nozzle. The result should be more consistent extrusion, especially around corners and other changes of direction. You should also be able to print faster without the quality dropping off so much.

This great feature was introduced into Marlin by Sebastianv650, and once enabled in the firmware, is tuned visually by inspecting a calibration pattern to find the best K value. This guide uses linear advance V1.5.

Please note the K value will differ for various filaments, and each one you want to use should be tuned. You can temporarily turn off linear advance by setting K to zero.

Marlin linear advance reference: http://marlinfw.org/docs/features/lin...
Calibration pattern generator: http://marlinfw.org/tools/lin_advance...
M900 Marlin reference: http://marlinfw.org/docs/gcode/M900.html
20mm calibration cube: https://www.thingiverse.com/thing:127...
My previous video on calibrating your esteps, retraction, etc:    • How to tune your slicer settings feat...  

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