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    • First things first: you're going to need a copy of RepRap Firmware.

    • Either download a fresh version from GitHub, or edit your existing one.

    • You can edit your existing firmware either through the online configuration tool, or through G-Code.

    • If you download a fresh version of RepRap Firmware you'll have to configure more settings than the ones mentioned in this guide so that it will work well with your printer.

  1. Flip the corresponding line in your config.g file from S1 to S0 or vice versa: M569
    • Flip the corresponding line in your config.g file from S1 to S0 or vice versa: M569

    • You can also simply send the M569 command through your favourite printer control software.

    • The next thing we'll have to update is your printer's E-steps-per-mm.

    • Your slicer will generate G-Code for your printer, which will tell it to extrude a certain length (in millimeters) of filament. Your printer takes those lengths of filament and calculates how much it should rotate the Hemera stepper motor to push out the expected amount filament. This number is used to make that conversion

    • For a x16 microstepping setting you should be using a value of 409.

  2. Over USB Connection
    • 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

    • Update your config.g file manually:

    • Update the following line with your new number: M92.

  3. Manual Editing: For firmware versions 1.16 and earlier, send the folowing G-Code command to your printer: M305 P1 B4388
    • Manual Editing:

    • For firmware versions 1.16 and earlier, send the folowing G-Code command to your printer: M305 P1 B4388

    • For firmware versions 1.17 and later, send the following command instead: M305 P1 B4725 C7.060000e-8

    • Online Tool:

    • Click on the Calculate Thermistor Coefficients button in the Heaters tab, and select Semitec 104-GT2 (used by E3D) from the drop-down menu.

    • Update, For the most recent version of the reap rap firmware you should be using the following parameters for the thermistor.

    • T parameter: 100 000

    • B parameter: 4725

    • C parameter: 7.06e-8

  4. Manual editing:
    • Manual editing:

    • Update your maximum temperature by sending the following G-Code command to your printer: M143 S285

    • While Hemera can be used for high temperature printing the maximum rated temperature of the thermistor is 285ºC.

    • Online Editing:

    • Update your maximum temperature by going to the heaters tab and changing the option to 285ºC.

    • Save the firmware to your SD card as you normally would. If you're having issues, check with your printer's manufacturer.

    • If you're unsure of how to update your printer's firmware, check with its manufacturer.

Finish Line

2 other people completed this guide.

Dan Rock

Member since: 06/07/2018

21,478 Reputation

40 Guides authored

2 Comments

What is the recommended motor current (M906) for Hemera?

Wes - Reply

Hello? Can has answer? Would be good to add a step indicating what M906 should be

Wes - Reply

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