HYC23 commented 4 years ago

I recently got an Ender 3 V2, but one of the stepper motor drivers on the motherboard is broken. I have an old ender 3 running SKR mini E3 board and works pretty well, so is the new SKR mini E3 V2 board support the new Ender 3 V2 printer, eg. the screen?

Madtom2925 commented 3 years ago

That was in reply to the problem quoted, not you. For this to work you have to modify the cable as listed above. Otherwise it will just beep. You will also need modified firmware, do you have a bltouch?

jernejp21 commented 3 years ago

Sorry to everyone it took some time. I have updated my original post with all the settings I have modified from Ender 3 V2 config file.

I see a lot of people are asking same questions over and over:

you have to create new ribbon cable, because pinout if different. DWIN display has different layout than CR10 display.
if your display is beeping, pinout is incorrect.
if you can't see image on display, pinout or FW is incorrect
if FW doesn't compile read all error messages. You might have multiple displays defined or you don't have the correct board selected in platformio.ini file.

Madtom2925 commented 3 years ago

Jernejp21 do you have eeprom enabled?

jernejp21 commented 3 years ago

You need EEPROM to store settings and to use M500 command.

Ogrenero commented 3 years ago

Era in risposta al problema citato, non tu. Affinché questo funzioni è necessario modificare il cavo come elencato sopra. Altrimenti emetterà solo un segnale acustico. Avrai anche bisogno di un firmware modificato, hai un bltouch?

yep i have bltouch

Madtom2925 commented 3 years ago

Jernejp21 did you have to make mods to the dwin file or did it work straight away for you?, some people seem to get a boot loop and others don't so maybe its version related

Jd1Ent commented 3 years ago

I have been following along with this thread. I recently >installed an SKR mini E3 v2.0 on my Ender 3 V2. With >your help and Youtube I have gotten to the point where >everything is working except, when I try to print >something, the printer will auto home, the progress bar >for the print will go to %100 very quickly but the printer >never moves after that. Also when try to bed level with >the BL Touch, it probes once and then stops

We would need to see your config and advconfig files to see what's going on.

I uploaded the config files to my profile in "skr-e3-v2.0-on-ender-3-v2"

Madtom2925 commented 3 years ago

I don't see anything obvious in the config, how is your bltouch wired?, is it plugged in to the z min header or the bltouch header?

Jd1Ent commented 3 years ago

I have it on the one labeled z probe.

Jd1Ent commented 3 years ago

I don't see anything obvious in the config, how is your bltouch wired?, is it plugged in to the z min header or the bltouch header?

I ended up disabling bl touch in firmware and now it will print, so I will have to dig into the bl touch settings to see what is going on.

Ogrenero commented 3 years ago

hi everyone, again, XD, after finding the cables needed to rewire the flat cable of the LCD and after modifying the firmware following the descriptions, everything went well except the self-leveling which insists on not working correctly. the probe after making the initial test when turning on the printer is as if it does not feel contact with the print plan, does anyone work correctly?

Ogrenero commented 3 years ago

I have been following along with this thread. I recently >installed an SKR mini E3 v2.0 on my Ender 3 V2. With >your help and Youtube I have gotten to the point where >everything is working except, when I try to print >something, the printer will auto home, the progress bar >for the print will go to %100 very quickly but the printer >never moves after that. Also when try to bed level with >the BL Touch, it probes once and then stops

We would need to see your config and advconfig files to see what's going on.

I uploaded the config files to my profile in "skr-e3-v2.0-on-ender-3-v2"

did u have plugged ur bltouch at z min on ur board?

Jd1Ent commented 3 years ago

I have been following along with this thread. I recently >installed an SKR mini E3 v2.0 on my Ender 3 V2. With >your help and Youtube I have gotten to the point where >everything is working except, when I try to print >something, the printer will auto home, the progress bar >for the print will go to %100 very quickly but the printer >never moves after that. Also when try to bed level with >the BL Touch, it probes once and then stops

We would need to see your config and advconfig files to see what's going on.

I uploaded the config files to my profile in "skr-e3-v2.0-on-ender-3-v2"

did u have plugged ur bltouch at z min on ur board?

It is plugged in to the one labeled "z probe" next to the display plug.

davthomaspilot commented 3 years ago

the printer will auto home, the progress bar >for the print will go to %100 very quickly but the printer >never moves after that

I see this behavior after completing a print, then starting a new one without power cycling the machine. But, it's with the stock ender V2 board.

If I can figure out where I should log or check that as an issue, I'll do it. Maybe related to the end G-code I'm using. The start G-code does the home and ABL. It might also be related to temperatures already being at or above their targets.

Anyway, you might just try having the home and ABL G-code in your slicer settings, then make sure you power cycle before printing. Works everytime for me, trying another print after the first always behaves as you describe.

kubiakoo commented 3 years ago

Hello, I would like to use the SKR mini E3 v2 board in the Ender 3 v2 but not with the pure Marlin firmware only with the TH3D Unfield 2- Creality Ender 3 Pro and SKR E3 Mini Board version. In their code I found only one difference from your post - pin programming in the file pins_BTT_SKR_MINI_E3_common.h. How should the pins be assigned in the TH3D version?

Your example:

                _____
            5V | 1 2 | GND
          PB15 | 3 4 | PB8
          PB9  | 5 6   RX1
         RESET | 7 8 | TX1
          PA15 | 9 10| PB5  
               -----
                EXP1

TH3D version:

                -----
            5V | · · | GND
 (LCD_D7)  PG7 | · · | PG6  (LCD_D6)
 (LCD_D5)  PG3 | · · | PG2  (LCD_D4)
 (LCD_RS) PD10 | · · | PD11 (LCD_EN)
(BTN_ENC)  PA8 | · · | PG4  (BEEPER)
                -----
                 EXP1

nospmMe commented 3 years ago

Hello, I followed this instruction but if I set ports like

SERIAL_PORT -1 SERIAL_PORT_2 1

compiling firmware fails.

With //SERIAL_PORT_2 1 firmware build access

timzor commented 3 years ago

I seem to have firmware that is working (am able to print from my OctoPrint). Just working on fixing the LCD now, but am confused by the new pinning requirements. Are we just swapping pins 7 and 8, so the cable would be: 1 --> 1 2 --> 2 3 --> 3 4 --> 4 5 --> 5 6 --> 6 7 --> 8 8 --> 7 9 --> 9 10 --> 10

OR, is it? 1 —> 1 2 —> 2 3 —> 3 4 —> 4 5 —> 9 6 —> 10 7 —> 8 8 —> 6 9 —> 5 (NC) 10 —> 7 (NC)

or... ?????

Please anyone who has it working, can you confirm what the pinning is? I don't understand the diagram. Thank you!

Jd1Ent commented 3 years ago

Here are my notes on the display wiring. Pin 9 and 10 on the display end and pin 5 and 7 on the controller board end, do not get connected to anything. I hope this makes sense.

On Sun, Feb 14, 2021, 12:26 AM timzor notifications@github.com wrote:

I seem to have firmware that is working (am able to print from my OctoPrint). Just working on fixing the LCD now, but am confused by the new pinning requirements. Are we just swapping pins 7 and 8, so the cable would be: 1 --> 1 2 --> 2 3 --> 3 4 --> 4 5 --> 5 6 --> 6 7 --> 8 8 --> 7 9 --> 9 10 --> 10

Please anyone who has it working, can you confirm what the pinning is? I don't understand the diagram. Thank you!

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/bigtreetech/BIGTREETECH-SKR-mini-E3/issues/424#issuecomment-778739841, or unsubscribe https://github.com/notifications/unsubscribe-auth/ASPLI2ASDJUCGCWVG5YHODTS653KXANCNFSM4SLUCEGQ .

Jd1Ent commented 3 years ago

Fixed it for you. Use this one. Your pin 7 and 8 were backward.

1 —> 1 2 —> 2 3 —> 3 4 —> 4 5 —> 9 6 —> 10 7 —> 6 8 —> 8 9 —> 5 (NC) 10 —> 7 (NC)

davthomaspilot commented 3 years ago

It seems that the stock Ender 3 V2 display isn't fully supported by Marlin (yet?). So, I'm using a plug-in in Octoprint to display messages from the G-code (M117).

Another example is that the z offset wizard isn't supported by Marlin on the Ender 3 V2 display. Not sure why, maybe just a todo. I may look at hacking the code, if the main issue is no support for messages on the V2 display--use the octoprint plugin instead.

t3chguy commented 3 years ago

You may wish to try https://github.com/Jyers/Marlin/tree/Ender_3_V2_Rewrite if you want more functionality on your V2 DWIN screen

davthomaspilot commented 3 years ago

Thanks for the tip. The readme makes it sound just like the bugfix branch. Are the changes relative to bugfix documented?

t3chguy commented 3 years ago

The whole DWIN implementation was rewritten in a more maintainable way and a lot of features were added like host controls, M75/M77, M600, M701/M702, lots more, there was a reddit thread about it but it was a few weeks back and a lot has moved since then

davthomaspilot commented 3 years ago

Do you think it will eventually be merged back to the official Marlin (and supported)? (I'll look for the thread)

t3chguy commented 3 years ago

Possibly, Jyers has already had one small chunk PR land in upstream to put more metrics on the print screen.

nospmMe commented 3 years ago

I´ve found a way to get Ender 3 V2 display working.

https://github.com/yohannaftali/Marlin-Firmware-BTT-SKR-Mini-Hemera I downloaded and changed firmware found at link above and now the display works very well.

Now I have a new issue, because the printer isn´t able to print any gcode, if there are following commands included

M109 wait for extruder temp M190 wait for bed temp

With Pronterface I get this

I can set any temperatur manually for hotend and bed without issues by Pronterface and also with Ender 3 V2 display. If I uncomment M109 and M190 in gcode the printer works like a charm.

Wo can help me please?

DarkSnart commented 3 years ago

@nospmMe link returns "no results". Do you have a valid link?

With M09 & M190 executed, how long is it taking before the ERROR shows?

nospmMe commented 3 years ago

@DarkSnart The printer is connected bye usb and to me it seems the link is stable.

The error came up immediately when gcode pass the commands M109 or M190.

Same happens if I start the gcode directly over sdcard. The printer stops immediately and goes in freeze.

I've realised that printing over sdcard isn't possible. No matter which gcode

DarkSnart commented 3 years ago

@nospmMe have you visited this thread? [(https://github.com/bigtreetech/BIGTREETECH-SKR-mini-E3/issues/465)] (https://github.com/bigtreetech/BIGTREETECH-SKR-mini-E3/issues/465)

pbinsted commented 3 years ago

Just wanted to mentioned make sure you are using the right default_envs = STM32F103RC_btt_512K or STM32F103RC_btt as appropriate depending on the chip on your board. I believe I'd been using the _512K which was flashing fine but causing random crashing and motor overheating.

edit - My printer still random crashes/freezes. Will open a new issue.

nospmMe commented 3 years ago

@DarkSnart please find new link: https://github.com/yohannaftali/Marlin-Firmware-BTT-SKR-Mini-Hemera Of course I visited your mentioned thread, thank you therefore. Unfortunately I didn´t find any solution there.

Instead of M109 and M190 currently I use G4 S90 for start gcode and that works for me.

@pbinsted this is my default_envs

[platformio] src_dir = Marlin boards_dir = buildroot/share/PlatformIO/boards default_envs = STM32F103RC_btt_512K include_dir = Marlin

Damquis commented 3 years ago

I was having a hard time with the wiring, I created this for myself, but maybe someone will find it useful. (The wire numbers are different on the software and hardware level :)) wiring

bholzer commented 3 years ago

I am having the same problem @nospmMe was having. If I try to compile the current state of the bugfix2.0 branch with the serial config suggested here, I get an error related to some serial code:

In file included from d:\marlin2bugfix\marlin\src\inc\marlinconfig.h:55:0,
                 from Marlin\src\HAL\STM32F1\HAL.cpp:30:
d:\marlin2bugfix\marlin\src\core\serial.h:71:34: error: 'MYSERIAL' was not declared in this scope
     typedef MultiSerial<decltype(MYSERIAL), decltype(SERIAL_CATCHALL), 0> SerialOutputT;
                                  ^~~~~~~~
d:\marlin2bugfix\marlin\src\core\serial.h:71:34: note: suggested alternative: 'MYSERIAL1'
     typedef MultiSerial<decltype(MYSERIAL), decltype(SERIAL_CATCHALL), 0> SerialOutputT;
                                  ^~~~~~~~
                                  MYSERIAL1
d:\marlin2bugfix\marlin\src\core\serial.h:71:34: error: 'MYSERIAL' was not declared in this scope
d:\marlin2bugfix\marlin\src\core\serial.h:71:34: note: suggested alternative: 'MYSERIAL1'
     typedef MultiSerial<decltype(MYSERIAL), decltype(SERIAL_CATCHALL), 0> SerialOutputT;
                                  ^~~~~~~~
                                  MYSERIAL1
d:\marlin2bugfix\marlin\src\core\serial.h:71:73: error: template argument 1 is invalid
     typedef MultiSerial<decltype(MYSERIAL), decltype(SERIAL_CATCHALL), 0> SerialOutputT;
                                                                         ^
In file included from d:\marlin2bugfix\marlin\src\inc\marlinconfig.h:55:0,
                 from Marlin\src\HAL\STM32F1\HAL.cpp:30:
d:\marlin2bugfix\marlin\src\core\serial.h: In function 'void SERIAL_CHAR(char)':
d:\marlin2bugfix\marlin\src\core\serial.h:100:47: error: request for member 'write' in 'multiSerial', which is of non-class type 'SerialOutputT {aka int}'
 inline void SERIAL_CHAR(char a) { SERIAL_IMPL.write(a); }
                                               ^~~~~

Trying to dig in a little deeper to see what's happening.

Damquis commented 3 years ago

@bholzer I used this (https://github.com/yohannaftali/Marlin-Firmware-BTT-SKR-Mini-Hemera) as a starting point, get rid of the Hemera related settings, added my probe settings, checked the modifications mentioned in the 5th comment and I was able to compile the firmware.

jernejp21 commented 3 years ago

@bholzer You are using new version. Please try with Marlin 2.0.7. A lot has changed since then, that's why my instructions arn't compatible with your version of Marlin.

bholzer commented 3 years ago

Thanks, can confirm I was able to get a build using 2.0.7. Now at the boot loop step, so making progress!

On Mar 8, 2021, at 8:22 PM, Jernej Pangerc notifications@github.com wrote:

@bholzer You are using new version. Please try with Marlin 2.0.7. A lot has changed since then, that's why my instructions arn't compatible with your version of Marlin.

— You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or unsubscribe.

Daniel38160 commented 3 years ago

After almost a week of head breaking I finally managed to compile everything correctly A BIG THANKS TO ALL OF YOU for your head breakage, and your research on the subject my ender3 v1 now works with a SKR mini E3 and an ender3 v2 screen and octoprint I am French zero in coding and in English thank you again to you 2021-03-13 (1)

seppelicous commented 3 years ago

After almost a week of head breaking I finally managed to compile everything correctly A BIG THANKS TO ALL OF YOU for your head breakage, and your research on the subject my ender3 v1 now works with a SKR mini E3 and an ender3 v2 screen and octoprint I am French zero in coding and in English thank you again to you

Great to hear, could you share your config files? Is it only the pinouts, which can easily be changed or are there many changes in the config needed?

Daniel38160 commented 3 years ago

@seppelicous For the pinout I followed the tutorial on the other hand without touching the original power supply. I did not connect the beeper because I do not find it useful nor the reset. I will try to redistribute my wiring and I will immediately send you my compilation of Marlin which passes for an Ender 3 v1 (for v2 you have to deactivate the fan and change the PIDs). There must still be communication issues because it does not show me the Zs on the screen. That said basic it suits me well.And in order not to have the reboot problems of the motherboard I deleted some files and replaced by others because of the language.

void HMI_SetLanguage () {

si ACTIVÉ (EEPROM_SETTINGS)

  # if (MOTHERBOARD == BOARD_CREALITY_V4)
       BL24CXX :: read (DWIN_LANGUAGE_EEPROM_ADDRESS, ( uint8_t *) & HMI_flag. language , sizeof (HMI_flag. language ));
  # endif

endif

HMI_SetLanguageCache (); }

void HMI_ToggleLanguage () { HMI_flag. langue = HMI_IsChinese ()? DWIN_ENGLISH: DWIN_CHINESE; HMI_SetLanguageCache ();

si ACTIVÉ (EEPROM_SETTINGS)

# if (MOTHERBOARD == BOARD_CREALITY_V4)
   BL24CXX :: write (DWIN_LANGUAGE_EEPROM_ADDRESS, ( uint8_t *) & HMI_flag. language , sizeof (HMI_flag. language ));
# endif

endif

}

This part of code prevents the motherboard from rebooting. Sorry but the zip file is too big but you can ask me by e-mail danieldugratin@gmail.com

rubesworkshop commented 3 years ago

I understand what changes need to be made to the ribbon cable. What I don't understand is how to go about making those changes. Can anyone offer links or guidance that might get me started?

Thanks, Andy

jernejp21 commented 3 years ago

@maddawgmax you take a new ribbon cable and 2 10-pin IDC connectors, and rearrange wires according to the guide above. For installing flat cable to IDC connector - you just press cable into the connector. Recommend you use a vise. With hands can be difficult.

Daniel38160 commented 3 years ago

@maddawgmax I did not cut the black and white wire (these are the power wires), it is not useful to cut the purple, orange and gray. So yellow (screen side) goes with red, green (screen side) goes with brown. At the end I find myself on the motherboard side with the yellow, green and blue which are not connected. And on the screen side, blue, red and brown

163959775_780007962944327_4211284550420655427_n 162227559_758320124870470_8473635928897311953_n 163239525_197500788445739_2131351642661449031_n

rubesworkshop commented 3 years ago

@maddawgmax you take a new ribbon cable and 2 10-pin IDC connectors, and rearrange wires according to the guide above. For installing flat cable to IDC connector - you just press cable into the connector. Recommend you use a vise. With hands can be difficult.

@jernejp21 Thank you. That’s exactly what I needed.

rubesworkshop commented 3 years ago

@maddawgmax I did not cut the black and white wire (these are the power wires), it is not useful to cut the purple, orange and gray. So yellow (screen side) goes with red, green (screen side) goes with brown. At the end I find myself on the motherboard side with the yellow, green and blue which are not connected. And on the screen side, blue, red and brown

@Daniel38160 Thanks for the pics.

Jexkin commented 3 years ago

Hey, I thought I'll describe my "journey" so far. I'm trying to get a working firmware for about 1 week now and my current firmware (an edited Hemera firmware for the Ender 3 V2) lets me successfully do a bed level with my BLTouch but I can't get a print to work (neither via the sdcard or Octoprint). I always get the same error "Changing monitoring state from "Error: Printer halted. kill() called!" to "Offline (Error: Printer halted. kill() called!)"", checked it via Octoprint terminal. I already tried to start from scratch but that didn't work out. Then I saw that jernejp21 posted a link to their fork, I successfully compiled it but I got stuck in a boot loop. I already checked and compared all the configuration.h and configuration_adv.h files with each other and I didn't see any differences (I'm fairly new to 3d printing so I for sure might be missing something). The edited Hemera firmware seems to work the best so far but I honestly don't know why I get that error. As for the display: everything seems to work, I was able to get the connections correct. So I'd assume there is no problem with the display. I for sure would appreciate any kind of help!

rubesworkshop commented 3 years ago

@Jexkin

Have you seen this link? https://github.com/yohannaftali/Marlin-Firmware-BTT-SKR-Mini-Hemera

Jexkin commented 3 years ago

@maddawgmax

yes, that's the Hemera firmware I wrote about. Downloaded it, removed the Hemera settings and I got the printer to "work" (bed leveling works via display and Octoprint but starting a prints gives me the error code (see above)). I basically only need to edit some lines in the configuration.h and configuration_adv.h file, right? Or is there any other file I need to edit some lines?

davthomaspilot commented 3 years ago

I can't read the thread very easily right now, but I think I recall there is a reset line in the wiring to/from the display. That line should not be left floating--continuous or spurious reboots can occur. Later tonight, I'll refresh my memory and comment again, if it seems appropriate. On Saturday, March 27, 2021, 01:08:15 PM EDT, Jexkin @.***> wrote:

@maddawgmax

yes, that's the Hemera firmware I wrote about. Downloaded it, removed the Hemera settings and I got the printer to "work" (bed leveling works via display and Octoprint but starting a prints gives me the error code (see above)). I basically only need to edit some lines in the configuration.h and configuration_adv.h file, right? Or is there any other file I need to edit some lines?

— You are receiving this because you commented. Reply to this email directly, view it on GitHub, or unsubscribe.

davthomaspilot commented 3 years ago

Edited on Mar 28 2021

This is tested on Marlin version 2.0.7. New Marlin version has changed SERIAL_PORT definition and a lot of other stuff. You can use my fork for speeding the process. This version works without a bootloader! If you you are using a bootloader, uncomment lines 752 and 753 in platformio.ini https://github.com/jernejp21/Marlin

Use Marlin's Ender 3 V2 Configuration.h and Configuration_adv.h files.

You need to import this code into pins_BTT_SKR_MINI_E3_common.h file. I pasted this part of code below USB connect control. This code can be found in pins_CREALITY_V4.h.
/**
 *        Ender 3 V2 display                         SKR Mini E3 V2.0
 *                _____                                     _____
 *            5V | 1 2 | GND                            5V | 1 2 | GND
 *   (BTN_E1) A  | 3 4 | B (BTN_E2)         (BTN_EN1) PB15 | 3 4 | PB8 (BTN_E2)
 *          BEEP | 5 6   ENT (BTN_ENC)                PB9  | 5 6   RX1
 *  (SKR_RX1) TX | 7 8 | RX (SKR_TX1)                RESET | 7 8 | TX1
 *            NC | 9 10| NC                  (BEEPER) PA15 | 9 10| PB5  (BTN_ENC)
 *                -----                                     -----
 *                EXP1                                      EXP1
 */
#if ENABLED(DWIN_CREALITY_LCD)

  // RET6 DWIN ENCODER LCD
  #define BTN_ENC                           PB5
  #define BTN_EN1                           PB15
  #define BTN_EN2                           PB8

  #ifndef BEEPER_PIN
    #define BEEPER_PIN                      PA15
    #undef SPEAKER
  #endif
#endif
Commented picture shows pinout for display and SKR board.

CAUTION!!! You have to create new ribbon cable. Connect SKR RX to display TX pin and SKR TX to display RX pin! This is the most important part (and setting the correct serial port in Marlin).

You can connect other pins as you like, just make sure you define correct pins in Marlin (you can connect display A to SKR's PB9 etc.).

Pinout for Ender 3 V2 display is printed on display's PCB. If you remove the back cover, you will see the connector marked.

After you have copied this code, adjusted pins on display and adjusted pins in Marlin for button and beeper, change also Configuration.h file.

set #define SERIAL_PORT -1, #define SERIAL_PORT_2 1.

set #define MOTHERBOARD BOARD_BTT_SKR_MINI_E3_V2_0

set #define X_DRIVER_TYPE TMC2209. Do this also fro X, Y and E0.

set #define INVERT_X_DIR true

set #define INVERT_Y_DIR true

set #define INVERT_Z_DIR false -set #define INVERT_E0_DIR true

set #define DWIN_CREALITY_LCD and comment out current display you are using.

Configuration_adv.h file.

set #define SDCARD_CONNECTION ONBOARD

under #if HAS_TRINAMIC_CONFIG, change motor current. I found out that 580 mA for X, Y and Z is ok. And 700 for E. You can play with this settings.

a little bit lower, change slave addresses for serial TX, RX.

define X_SLAVE_ADDRESS 0

define Y_SLAVE_ADDRESS 2

define Z_SLAVE_ADDRESS 1

define E0_SLAVE_ADDRESS 3

set #define CHOPPER_TIMING CHOPPER_DEFAULT_24V if you are using 24V power supply

Make sure you also change platformio.ini . Change default_envs = STM32F103RC_btt_512K. You are now using SKR board, not Ender.

From here on you can change Marlin to use BL Touch, sensorless homing etc.

jernejp21 ,

I just noticed you updated your earlier post. I figure I'll download the latest bugfix and work with it.

I went ahead and ordered at BigTreeTech TFT display. Any advice about using it versus doing the rewire for the Ender 3 V2 display?

bigtreetech / BIGTREETECH-SKR-mini-E3

Will SKR mini E3 support Ender 3 V2? #424

si ACTIVÉ (EEPROM_SETTINGS)

endif

si ACTIVÉ (EEPROM_SETTINGS)

endif

define X_SLAVE_ADDRESS 0

define Y_SLAVE_ADDRESS 2

define Z_SLAVE_ADDRESS 1

define E0_SLAVE_ADDRESS 3