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    topic_solved I need help with setting up a BLTouch

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    • BismuthBlues
      BismuthBlues last edited by

      As it turns out, as a beginner to all of this, I have no idea what I am doing, and need some help setting up a BLTouch (v3.1) on my duet 2 ethernet.

      I used the reprap configurator and also tried using the betrue guide but havent had much success. Any help would be greatly appreciated. I have uploaded .txt versions of various .g files. retractprobe g; homez g; deployprobe g ;config g

      The wires are plugged in as follows:
      Red - Expansion 1) +5V;
      Brown - Expansion 2) GND
      Orange - Expansion 8 ) Heater 3
      Black - Z probe GND
      White - Z_probe_In

      I want the BLTouch to be the Z-endstop and for checking the level of the bed. I have a Cartesian printer.

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      • Phaedrux
        Phaedrux Moderator last edited by

        Can you confirm that you have RRF3 flashed on the board? Your configs indicate that's the case, but that just means the web configurator gave you the settings for RRF3. Does your board actually have it installed? You can send M115 to get the currently installed firmware version.

        What exactly doesn't work?

        If you send M401 and M402 does the pin deploy and retract?

        If you send the servo control gcode to put the BLTouch in self-test mode, does it work?

        What does the probe do when power is first applied?

        BismuthBlues 1 Reply Last reply Reply Quote 0
        • Phaedrux
          Phaedrux Moderator last edited by Phaedrux

          ; Z-Probe
          M950 S0 C"exp.heater3"                        ; create servo pin 0 for BLTouch
          M558 P9 H3 F500 T4000            ; F120 T6000 set Z probe type to bltouch and the dive height + speeds
          

          The M558 would be correct for 2.x firmware versions, but not correct for rrf3.

          Once again, it would help to know exactly what firmware version you have installed and intend to use.

          If you are running RRF3, try this isntead

          M558 P9 C"^zprobe.in" H5 F120 T4000  ; BLTouch connected to Z probe IN pin
          M950 S0 C"exp.heater3" ; create servo/gpio 0 on heater 3 pin on expansion connector
          
          BismuthBlues 1 Reply Last reply Reply Quote 0
          • BismuthBlues
            BismuthBlues @Phaedrux last edited by

            @Phaedrux said in I need help with setting up a BLTouch:

            M558 P9 C"^zprobe.in" H5 F120 T4000 ; BLTouch connected to Z probe IN pin
            M950 S0 C"exp.heater3" ; create servo/gpio 0 on heater 3 pin on expansion connector

            I do have RRF3. I tried putting this in and when I click home z, the probe deploys but doesnt retract, and nothing else happens.

            Thank you for your help, I really appreciate it.

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            • BismuthBlues
              BismuthBlues @Phaedrux last edited by

              @Phaedrux

              When I click Home Z, the probe deploys but doesnt retract, and the printer gets stuck on the Z Home command for a while.

              M401 and M402 do work like they should.

              I am not sure what the servo control gcode is. I may be in a little over my head with this project....

              When power is first applied, the BLTouch lights up red, and then deploys and retracts twice. After that, the BLTouch stays lit up solid red.

              dc42 1 Reply Last reply Reply Quote 0
              • dc42
                dc42 administrators @BismuthBlues last edited by

                @BismuthBlues said in I need help with setting up a BLTouch:

                When I click Home Z, the probe deploys but doesnt retract, and the printer gets stuck on the Z Home command for a while.

                Please post your homez.g file.

                BismuthBlues 1 Reply Last reply Reply Quote 0
                • BismuthBlues
                  BismuthBlues @dc42 last edited by

                  @dc42 retractprobe.g; homez.g; deployprobe.g; config.g

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                  • Phaedrux
                    Phaedrux Moderator last edited by

                    G90               ; absolute positioning
                    G1 X35 Y-17 F6000 ; go to first probe point
                    G30               ; home Z by probing the bed
                    

                    G31 P25 X-20 Y32 Z0

                    In your homez you have the probe move to an odd absolute position based on your probe offset. Try changing it to move to the center of the bed.

                    BismuthBlues 1 Reply Last reply Reply Quote 0
                    • BismuthBlues
                      BismuthBlues @Phaedrux last edited by BismuthBlues

                      @Phaedrux I made a change to it to move the head to the middle. The now head moves to the middle, deploys the probe, and then nothing happens. After a while, the probe gets retracted.

                      I am sure its just that I have no idea what I am doing. The Z-axis of my printer is like it would be on a gantry robot, I am guessing that I didn't configure it correctly, but I don't know what I did wrong.

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                      • Phaedrux
                        Phaedrux Moderator last edited by

                        What do you mean like a gantry robot?

                        Does the z axis move at all?

                        BismuthBlues 2 Replies Last reply Reply Quote 0
                        • BismuthBlues
                          BismuthBlues @Phaedrux last edited by BismuthBlues

                          @Phaedrux Sorry I was unclear. This is my printer: https://imgur.com/a/YOc4DmV. So the head moves up and down on the arm.

                          Phaedrux 1 Reply Last reply Reply Quote 0
                          • BismuthBlues
                            BismuthBlues @Phaedrux last edited by

                            @Phaedrux Turns out, I am just really bad at math and gear ratios. The Z-axis is moved with some gears and belts, and I dramatically miscalculated the number of steps per mm for the z axis. I still need to figure out the math exactly, but once I increased it from 5 to around 200, it is working correctly.
                            Thank you for your help, and sorry for wasting your time...

                            1 Reply Last reply Reply Quote 1
                            • Phaedrux
                              Phaedrux Moderator @BismuthBlues last edited by

                              @BismuthBlues said in I need help with setting up a BLTouch:

                              @Phaedrux Sorry I was unclear. This is my printer: https://imgur.com/a/YOc4DmV. So the head moves up and down on the arm.

                              That's a very interesting printer. Is it a cartesian where the bed is stationary and the print head moves in X Y Z?

                              BismuthBlues 1 Reply Last reply Reply Quote 0
                              • BismuthBlues
                                BismuthBlues @Phaedrux last edited by

                                @Phaedrux Yes, it is! It's being converted from an old piece of lab equipment that didn't work anymore.

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                                • Phaedrux
                                  Phaedrux Moderator last edited by

                                  Cool. I hope you post more about it.

                                  BismuthBlues 1 Reply Last reply Reply Quote 0
                                  • BismuthBlues
                                    BismuthBlues @Phaedrux last edited by

                                    @Phaedrux Thanks! Once it is up and working, I plan on doing a detailed write up with a fair number of pictures.

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