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Editing Step 7 —

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If you have an LCD Screen:

Navigate to Control → Motion → Steps/mm → Esteps/m and enter your new E-steps-per-mm value.

Select Store Settings in the Control menu to save your settings.

Over USB Connection

Use a printer control software to connect to your printer. Send the command M92 E<your number here>to your printer.

Then, send M500 to store your settings

If you don't have EEPROM, or want your firmware to be consistant with your EEPROM:

Update the following line with your new value in the E-steps spot: #define DEFAULT_AXIS_STEPS_PER_UNIT {<X-axis> <Y-steps> <Z-steps> <E-steps>}. Upload your firmware as normal.