Extrusion Test

Based on the spreadsheet introduced by this CNC Kitchen video

Use this form to generate G-code that you can use to calibrate your Extrusion Multiplier. Default values apply to standard ABS with a 0.4mm nozzle.

Press the Generate G-code button followed by Download as file to save the result.

warning

warning

Settings			G-code
Printer:
Printer:
Filament:
Filament Diameter:		Diameter of the used filament (mm)
Start G-code:	M112 ; Refer to https://bit.ly/3q1dChR M190 S110 ; <-- SET BED TEMPERATURE HERE - Wait to heat bed M109 S240 ; <-- SET NOZZLE TEMPERATURE HERE - Wait to heat extruder for homing accuracy G28 ; Home all axis G32 ; Home all axis, tram gantry G90 ; Use absolute positioning G1 Z5 F100 ; Move to safe Z BED_MESH_CALIBRATE ; Create mesh PRINT_START ; PRINT_START EXTRUDER=240 BED=110 ; If using parameter-ized PRINT_START Copy the start G-code from your slicer and set the appropriate parameters. Be sure to check over the entire Start G-code every time before generating.
End G-code:	PRINT_END Copy the end G-code from your slicer and set any appropriate parameters.
Retraction Distance:		Retraction distance (mm)
Fan Speed:		Fan Speed (%)
Print Bed:
Bed Size X:		Size (mm) of the bed in X
Bed Size Y:		Size (mm) of the bed in Y
Bed Margin:		Minimum distance from edge of bed to the print
Speed:
Use mm/s:		Use mm/s instead of mm/min
Movement Speed:		Movement speed
Retract Speed:		Retract Speed of the extruder
Unretract Speed:		Unretract Speed of the extruder
Pattern:
Starting Value for Flow:		Starting value for the Flow Rate
Ending Value for Flow:		Ending value of the Flow
Flow Stepping:		Stepping of the Flow in the test pattern. Needs to be an exact divisor of the Flow Range (End - Start)
Starting Value for Temperature:		Starting value for the Temperature
Ending Value for Temperature:		Ending value of the Temperature
Temperature Stepping:		Stepping of the Temperature in the test pattern. Needs to be an exact divisor of the Temperature Range (End - Start)
Advanced:
Blob Height		Height of the printed blob
Extrusion Amount		Length of filament to extrude into the blob
Prime Length:		Length of the prime move
Prime Amount:		Filament to extrude during the prime move
Prime Printing Speed:		Speed of the prime move
Wipe Length:		Distance between end of prime line and centre of the blob
Dwell Time:		Inserts a pause of x seconds before starting each prime line
Filename:	warning warning warning

Notes on the settings:

• The script checks to make sure the blobs do not collide with the toolhead. Verify it using a host software like Printrun or Repetier Host.
• Start, End, and Stepping Value for the test determines the number of rows and columns generated. For example a Start Value of 50, an End Value of 100 and a Stepping Value of 25 will create 5 rows or columns.
• The proper Extrusion Multiplier depends on the filament, nozzle size, nozzle geometry and printing temperature. If any of these values change, the calibration might need to be repeated.

Images

The following images show some examples of the test patterns