K-factor Calibration Pattern
There are two versions of Linear Advance. Linear Advance 1.0 is in Marlin 1.1.8 and earlier. Marlin 1.1.9 and up have Linear Advance 1.5.
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|Diameter of the used filament (mm)|
|Diameter of the nozzle (mm)|
|Nozzle Temperature (°C)|
|Bed Temperature (°C)|
|Retraction distance (mm)|
|Layer Height (mm)|
|Rectangular or round bed. Round beds will activate Origin Bed Center|
|Size (mm) of the bed in X|
|Size (mm) of the bed in Y|
|Set the origin position (X0 Y0) to bed center instead of front-left corner|
|Use mm/s instead of mm/min|
|Slow printing speed|
|Fast printing speed. This should differ noticeably from Slow Speed|
|Retract Speed of the extruder|
|Set printing acceleration (mm/s^2)|
|Set the Jerk for the X-axis. -1 to use firmware default|
|Set the Jerk for the Y-axis. -1 to use firmware default|
|Set the Jerk for the Z-axis. -1 to use firmware default|
|Set the Jerk for the Extruder. -1 to use firmware default|
|Select version 1.0 for Marlin 1.1.8 and earlier. Select 1.5 for Marlin 1.1.9 / 2.0 and up|
|Select standard or alternate pattern|
|Starting value for the K-factor. Usually 0 but for bowden setups you might want to start higher, e.g. 30|
|Ending value of the K-factor. Bowden setups may be higher than 100|
|Stepping of the K-factor in the test pattern. Needs to be an exact divisor of the K-factor Range (End - Start)|
|Length of the Slow Speed test-line (mm)|
|Length of the Fast Speed test-line (mm)|
|Distance between the test lines. This will impact print size|
|Adds a frame around the start and end points of the test lines. May improve adhesion|
|Rotates the print in 45° steps|
|Prints the K-value besides every second test line|
|Ratio between nozzle diameter and extruded line width. Should be between 1.05 and 1.2|
|Offset the Z-axis for manual Layer adjustment|
|Level bed before printing. Bed leveling has to be activated|
|Use Firmware Retract. Needs to be activated in Marlin|
|Prime the nozzle before starting the test pattern|
|The default of 2.5 results in roughly 1mm of filament for 10mm line length|
|Speed of the prime move|
|Inserts a pause of x seconds before starting the test pattern to bleed off any residual nozzle pressure|
Notes on the settings:
Fast Printing Speedand
Slow Printing Speedshould be significantly different or the K-factor effect will barely be visible.
Use Bed Levelingrequires a probe.
- For round beds the option
Origin Bed Centeris automatically activated.
- The overall width (X-direction) of the print depends on the
Fast Speed Lengthand
Slow Speed Lengthsettings plus 5mm for the priming line. The length (Y-direction) depends on the K-factor Settings and
- The script checks to make sure the print fits on the bed. Verify it using a host software like Printrun or Repetier Host.
End Valuefor the K-factor determines the range that the test pattern will cover. For example a
Start Valueof 50 and an
End Valueof 150 will test a range of 100.
K-factor Steppingdetermines how many test lines are printed for the above range. For example, a Stepping of 10 and a range of 100 results in 10 test lines. A stepping of 3 would not work in this example as 100 cannot be exactly divided by 3. The script will throw an error message if an exact division is not possible. In this case either the range or the stepping needs to be adjusted.
Alternate Patternhas a second line of
Fast Printing Speedto test 0 to
Fast Printing Speedand back to 0 conditions. Best used with an increased
Test Line Spacingand reduced K-factor range.
- The proper K-factor depends on the filament, nozzle size, nozzle geometry and printing temperature. If any of these values change, the calibration might need to be repeated.
The following screen-shots show some examples of the test patterns
- Blue Lines are Slow Printing Speeds
- Red Lines are Fast Printing Speed
- Light blue lines are movements
Alternate Pattern with increased Test Line Spacing
Standard Pattern with Frame
45° rotated Alternate Pattern