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    topic_solved desperate, about to give up

    Firmware installation
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    • printingmark
      printingmark last edited by

      Hallo everybody,
      i am beginnning to get desperate
      trying for more than a week now, got help here a few days a go it workt for 2 prints and now every time i want to print ik starts at a differend place on the bed
      i have a ender 3 pro, bed is 235x235 it has a bltouch, i am not verry technical, so please be patient with me config.json

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      • A Former User
        A Former User last edited by

        if you press home all, and run G0 X120Y120 and repeat it a few times does the printer go to the same position each time?

        unless the slicer is set to do some randomization to spread print surface wear you'll probably be loosing steps some how. low motor current/high friction, slack in belts, grub screw on drive pulley loose etc?

        printingmark 1 Reply Last reply Reply Quote 1
        • printingmark
          printingmark @Guest last edited by

          @bearer every time i press home or G0 X120Y120 it is going to a differend place
          the belts and grub screw ore i think oke
          but i have now idea how to check the motor current

          A Former User 1 Reply Last reply Reply Quote 0
          • A Former User
            A Former User @printingmark last edited by

            @printingmark said in desperate, about to give up:

            but i have now idea how to check the motor current

            according to your config.json its set to 400mA. idk what the nominal value for the ender 3 motors are but it sounds a bit low to me.

            but you'd want to check your config.g file on the printer, the lines that say M906

            https://duet3d.dozuki.com/Wiki/Gcode#Section_M906_Set_motor_currents

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            • A Former User
              A Former User last edited by

              hang on, if the printer goes to a different place when you press home, its probably your home-all.g file that is the problem.

              whosrdaddy 1 Reply Last reply Reply Quote 0
              • whosrdaddy
                whosrdaddy @Guest last edited by

                @bearer no you are on the right track, motor currents are way too low.
                @printingmark try setting 1000ma for the xyz motors and 1300ma for the extruder motor.

                printingmark 1 Reply Last reply Reply Quote 2
                • printingmark
                  printingmark @whosrdaddy last edited by

                  @whosrdaddy done that but it didnt helpconfig.g

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                  • A Former User
                    A Former User last edited by

                    i'd start by going over everything that is needed to make the printer home correctly.

                    this is for the maestro board, but most of it applies to the wifi as well

                    https://duet3d.dozuki.com/Guide/Ender+3+Pro+and+Duet+Maestro+Guide+Part+3:+Commissioning/39#s145

                    steps 3 through 6 should help.

                    printingmark 1 Reply Last reply Reply Quote 1
                    • printingmark
                      printingmark @Guest last edited by

                      @bearer i will try, thanks

                      1 Reply Last reply Reply Quote 0
                      • printingmark
                        printingmark last edited by

                        for the moment all is working, thank you verry much all for the helpπŸ‘ πŸ‘

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                        • RS
                          RS last edited by

                          @printingmark @whosrdaddy If memory serves me well, 1000 mA is too much for the Ender's stock motors.
                          I have the following currents: X/Y/Z=725 mA, extruder=850 mA.
                          That's within the motor's specifications (around 80-85% of max current, I believe), and works well.

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                          • whosrdaddy
                            whosrdaddy last edited by

                            if i'm not mistaken, the Ender 3 motors are rated for 1300ma and the extruder 1700ma, so 1000 and 1300 (a bit under 80%) should be no problem.Offcourse, if it works with lower currents, that's even better πŸ™‚

                            1 Reply Last reply Reply Quote 1
                            • RS
                              RS last edited by

                              @whosrdaddy: Unfortunately I don't have any kind of official documentation about the Ender 3's steppers. The source I'm working from is this: https://gist.github.com/knoopx/e6c40a009e796203b93a75a3ed6a5ab8
                              Those currents work, and the steppers don't get too hot, so I'm happy.

                              But if anyone has other, more official sources, I'd be interested.

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                              • whosrdaddy
                                whosrdaddy last edited by

                                This post is deleted!
                                1 Reply Last reply Reply Quote 0
                                • printingmark
                                  printingmark last edited by

                                  this morning it started all over again,repeated all stps no succes

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                                  • printingmark
                                    printingmark last edited by

                                    config.json

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                                    • jay_s_uk
                                      jay_s_uk last edited by

                                      Can you share the config.g file instead please? The config.json is generated from the RRF config tool and then not adjusted again.
                                      Can you also supply your homeall, homex, homey and homez files?

                                      1 Reply Last reply Reply Quote 0
                                      • printingmark
                                        printingmark last edited by

                                        homez.g homey.g homex.g homeall.g config.g

                                        JoergS5 droftarts Karma 3 Replies Last reply Reply Quote 0
                                        • JoergS5
                                          JoergS5 @printingmark last edited by JoergS5

                                          This post is deleted!
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                                          • droftarts
                                            droftarts Moderator @printingmark last edited by

                                            @printingmark if it’s not homing to the right place, are you sure your Endstops are plugged in correctly? Sounds like X and Y may be swapped.

                                            Ian

                                            printingmark 2 Replies Last reply Reply Quote 1
                                            • printingmark
                                              printingmark @droftarts last edited by

                                              @droftarts i will check thanks

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                                              • printingmark
                                                printingmark @droftarts last edited by

                                                @droftarts you where on the right track,one of the endstops was broken i saw movement in it while checking te connection
                                                thank you

                                                1 Reply Last reply Reply Quote 1
                                                • Karma
                                                  Karma @printingmark last edited by

                                                  @printingmark Mark, I would suggest that you look at the following

                                                  M566 X1200.00 Y1200.00 Z24.00 E300.00 ; set maximum instantaneous speed changes (mm/min)
                                                  M203 X30000.00 Y30000.00 Z300.00 E1500.00 ; set maximum speeds (mm/min)
                                                  M201 X500.00 Y500.00 Z100.00 E5000.00 ; set accelerations (mm/s^2)

                                                  I beg anyone to please insure that I am giving the correct information and help for him. I am very new the REPRAP Firmware. Mark, please change that code listed above thats in your config.g file to the following

                                                  M566 X600.00 Y600.00 Z12.00 E150.00 ; set maximum instantaneous speed changes (mm/min)
                                                  M203 X3000.00 Y3000.00 Z30.00 E150.00 ; set maximum speeds (mm/min)
                                                  M201 X500.00 Y500.00 Z100.00 E500.00 ; set accelerations (mm/s^2)

                                                  The way you described your problem makes me feel like your stepper motors are skipping big time. I had this very same issue and I had to basically lower all those values down to almost nothing. After changing those valves listed above, my printer started to work like a champ. Produced some nice prints.

                                                  I own a Tevo Black Widow. I know you said you own an Ender 3. Those numbers I listed above for you to change will not hurt anything at all. But you can play with them so they fit your printer. I am only suggesting those numbers as a guideline to start at.

                                                  Keep us posted on your success.

                                                  Shawn B. aka Karma

                                                  1 Reply Last reply Reply Quote 1
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