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  • Prusa i3 MK3 Firmware Modifications Written By: Dan Rock

    Prusa i3 MK3 Firmware Modifications Draft: 2020-02-11Guide ID: 141 -

    This document was generated on 2020-02-16 08:37:11 PM (MST).

    © 2020 e3d-online.dozuki.com/ Page 1 of 13

  • INTRODUCTION

    Please note:

    The change in mounting means the calibration wizards will fail, only calibrate the Z height.

    Prusa i3 MK3 Firmware Modifications Draft: 2020-02-11Guide ID: 141 -

    This document was generated on 2020-02-16 08:37:11 PM (MST).

    © 2020 e3d-online.dozuki.com/ Page 2 of 13

  • Step 1 — Prusa i3 MK3 Firmware Modifications

    Because the Prusa i3 MK3 already uses an E3D HotEnd the firmware change for Hemera consists of changing the E steps per mm and entering new nozzle to probe offset values.

    Step 2

    Download fresh Prusa i3 MK3 firmware: https://github.com/prusa3d/Prusa-Firmwar...

    If you haven't already, also install the Arduino IDE. https://www.arduino.cc/en/Main/Software

    Prusa i3 MK3 Firmware Modifications Draft: 2020-02-11Guide ID: 141 -

    This document was generated on 2020-02-16 08:37:11 PM (MST).

    © 2020 e3d-online.dozuki.com/ Page 3 of 13

    https://github.com/prusa3d/Prusa-Firmware https://www.arduino.cc/en/Main/Software

  • Step 3

    Connect the Prusa to your Computer.

    Step 4

    Power on.

    Prusa i3 MK3 Firmware Modifications Draft: 2020-02-11Guide ID: 141 -

    This document was generated on 2020-02-16 08:37:11 PM (MST).

    © 2020 e3d-online.dozuki.com/ Page 4 of 13

  • Step 5

    Navigate to the firmware folder.

    Step 6

    Navigate to the variants folder

    Find the file named "1_75_MK3-EINSy10a-E3Dv6full.h"

    Rename it to "Configuration_prusa.h"

    Prusa i3 MK3 Firmware Modifications Draft: 2020-02-11Guide ID: 141 -

    This document was generated on 2020-02-16 08:37:11 PM (MST).

    © 2020 e3d-online.dozuki.com/ Page 5 of 13

  • Step 7

    Copy and paste the file into the previous firmware folder.

    Step 8

    Double click to open the Firmware.INO file.

    Prusa i3 MK3 Firmware Modifications Draft: 2020-02-11Guide ID: 141 -

    This document was generated on 2020-02-16 08:37:11 PM (MST).

    © 2020 e3d-online.dozuki.com/ Page 6 of 13

  • Step 9

    Click file - preferences.

    Paste into the Additional Boards Manager URLs field: https://raw.githubusercontent.com/prusa3...

    Prusa i3 MK3 Firmware Modifications Draft: 2020-02-11Guide ID: 141 -

    This document was generated on 2020-02-16 08:37:11 PM (MST).

    © 2020 e3d-online.dozuki.com/ Page 7 of 13

    https://raw.githubusercontent.com/prusa3d/Arduino_Boards/master/IDE_Board_Manager/package_prusa3d_index.json

  • Step 10

    Select: Tools - Board - Boards Manager.

    Scroll to the bottom and install "Prusa Research AVR MK3 RAMBo EINSy by Prusa research."

    Step 11

    Select Tools - Boards: PrusaResearch EINSY RAMBo

    Prusa i3 MK3 Firmware Modifications Draft: 2020-02-11Guide ID: 141 -

    This document was generated on 2020-02-16 08:37:11 PM (MST).

    © 2020 e3d-online.dozuki.com/ Page 8 of 13

  • Step 12

    Find the config.h tab

    Make sure #define LANG_MODE is set to 0, otherwise the screen will not display correctly when the firmware is flashed.

    Step 13

    Navigate to the Configuration_prusa.h tab.

    Scroll down to line 429.

    Change #define X_PROBE_OFFSET_FROM_EXTRUDER 23 to 54

    Change Y_PROBE_OFFSET_FROM_EXTRUDER 5 to 11

    Prusa i3 MK3 Firmware Modifications Draft: 2020-02-11Guide ID: 141 -

    This document was generated on 2020-02-16 08:37:11 PM (MST).

    © 2020 e3d-online.dozuki.com/ Page 9 of 13

  • Step 14

    Select the COM port that the Prusa is connected to.

    Don't worry if your port number is different than shown, any peripherals connected will show up as a COM port, double check device manager if you are unsure which to connect to.

    Step 15

    Press upload to flash the firmware.

    Prusa i3 MK3 Firmware Modifications Draft: 2020-02-11Guide ID: 141 -

    This document was generated on 2020-02-16 08:37:11 PM (MST).

    © 2020 e3d-online.dozuki.com/ Page 10 of 13

  • Step 16

    Download and Install Proterface.

    https://www.pronterface.com/

    Step 17

    Check the baudrate is 115200

    Check you have the correct COM port selected. (this will be different from computer to computer)

    Then click connect

    Prusa i3 MK3 Firmware Modifications Draft: 2020-02-11Guide ID: 141 -

    This document was generated on 2020-02-16 08:37:11 PM (MST).

    © 2020 e3d-online.dozuki.com/ Page 11 of 13

    https://www.pronterface.com/

  • Step 18

    Type in M 503 to view the currently stored settings.

    From this you should see the Esteps per mm is 161.30, unless you have calibrated the Esteps seperatly.

    Step 19

    Send M92 786.5 to the command line.

    This should set the E steps to 786.5

    In order to store that to the EEPROM you need to follow up with a M500 command.

    Prusa i3 MK3 Firmware Modifications Draft: 2020-02-11Guide ID: 141 -

    This document was generated on 2020-02-16 08:37:11 PM (MST).

    © 2020 e3d-online.dozuki.com/ Page 12 of 13

  • Step 20

    This e steps value is a starting point, we recommend running an e step calibration in order to fine tune your printers performance.

    Prusa i3 MK3 Firmware Modifications Draft: 2020-02-11Guide ID: 141 -

    This document was generated on 2020-02-16 08:37:11 PM (MST).

    © 2020 e3d-online.dozuki.com/ Page 13 of 13

    Prusa i3 MK3 Firmware Modifications Written By: Dan Rock INTRODUCTION Step 1 — Prusa i3 MK3 Firmware Modifications Step 2 Step 3 Step 4 Step 5 Step 6 Step 7 Step 8 Step 9 Step 10 Step 11 Step 12 Step 13 Step 14 Step 15 Step 16 Step 17 Step 18 Step 19 Step 20

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