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    BLTouch working

    Scheduled Pinned Locked Moved
    Duet Hardware and wiring
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    • iDeveloundefined
      iDevelo
      last edited by

      @Sniffle:

      the bltouch documentation suggests 1.5mm if i remember correctly

      Thanks.

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      • iDeveloundefined
        iDevelo
        last edited by

        Has anyone had an issue with it going into error state in the middle of a print and dropping the pin? It happened twice now. After the first time I re-wired it but it's just happened again!

        Apart from that it does give good first layer results.

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        • iDeveloundefined
          iDevelo
          last edited by

          Here's a video of what happens. It can happen at any point in the print.

          https://youtu.be/kpLTjELdzYQ

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          • Sniffleundefined
            Sniffle
            last edited by

            You may need to adjust the top grub screw down slightly as that controls teh electromagnet and may help it to stick. Also check the voltage right at the bltouch(you may be having some voltage droop over distance and may require some type of capacitor in-line but that's not my field of expertise, V-Droop is strictly a guess)

            I had this issue for a short while but it was due to the connections coming loose. I connected them and put heatshrink tubing on them to make sure they stayed together always. I have also had to adjust the grubscrew in the past, I've never had a voltage droop issue though. and on my corexy it has a about a meter of wire between the board and the bltouch.

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            • iDeveloundefined
              iDevelo
              last edited by

              @Sniffle:

              You may need to adjust the top grub screw down slightly as that controls teh electromagnet and may help it to stick. Also check the voltage right at the bltouch(you may be having some voltage droop over distance and may require some type of capacitor in-line but that's not my field of expertise, V-Droop is strictly a guess)

              I had this issue for a short while but it was due to the connections coming loose. I connected them and put heatshrink tubing on them to make sure they stayed together always. I have also had to adjust the grubscrew in the past, I've never had a voltage droop issue though. and on my corexy it has a about a meter of wire between the board and the bltouch.

              Thanks. Even disconnected, the pin should hold from what I've seen. With no power to mine the pin just drops, adjusting the grub screw makes no difference. I think it's just defective now.

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              • Sniffleundefined
                Sniffle
                last edited by

                @iDevelo:

                @Sniffle:

                You may need to adjust the top grub screw down slightly as that controls teh electromagnet and may help it to stick. Also check the voltage right at the bltouch(you may be having some voltage droop over distance and may require some type of capacitor in-line but that's not my field of expertise, V-Droop is strictly a guess)

                I had this issue for a short while but it was due to the connections coming loose. I connected them and put heatshrink tubing on them to make sure they stayed together always. I have also had to adjust the grubscrew in the past, I've never had a voltage droop issue though. and on my corexy it has a about a meter of wire between the board and the bltouch.

                Thanks. Even disconnected, the pin should hold from what I've seen. With no power to mine the pin just drops, adjusting the grub screw makes no difference. I think it's just defective now.

                talk to the antclabs folks occasionally the magnet will be weak, they will send you a new pin for free, and that usually fixes it.

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                • rlhotroddingundefined
                  rlhotrodding
                  last edited by

                  I just wanted to thank everyone for their help on the Bltouch.

                  I just got it installed and working great. Just something that I discovered during setup, watch out for the config override file.
                  It seems that it was turning heater 3 back to heater status instead of servo.

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                  • claustroundefined
                    claustro
                    last edited by

                    Anyone can confirm this wiring?
                    I read the wiki and it say to connect only 4 wires coming from bltouch isn't the 3 wires gnd connected?

                    BLTOUCH DUETWIFI

                    2wires cable
                    GND –----------Z probe GND
                    OUT--------------Z probe IN

                    3wires cable
                    +5V–------------+5 (pin1)
                    GND--------------???????
                    Control----------Heater3 (pin8)

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                    • dc42undefined
                      dc42 administrators
                      last edited by

                      Perhaps the ground should be connected to pin 2 of the expansion connector? I don't have a BLtouch, so perhaps someone else can confirm this.

                      Duet WiFi hardware designer and firmware engineer
                      Please do not ask me for Duet support via PM or email, use the forum
                      http://www.escher3d.com, https://miscsolutions.wordpress.com

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                      • iDeveloundefined
                        iDevelo
                        last edited by

                        @dc42:

                        Perhaps the ground should be connected to pin 2 of the expansion connector? I don't have a BLtouch, so perhaps someone else can confirm this.

                        Correct.

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                        • dc42undefined
                          dc42 administrators
                          last edited by

                          Thanks, I've updated the wiki.

                          Duet WiFi hardware designer and firmware engineer
                          Please do not ask me for Duet support via PM or email, use the forum
                          http://www.escher3d.com, https://miscsolutions.wordpress.com

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                          • HenrikMundefined
                            HenrikM
                            last edited by

                            That wiring is correct.
                            My bltouch is working perfect and i tried a extreme bed compensation with 1.5 mm high on one side and 1.5 mm low on other side and i got a Perfect first layer 🙂

                            BUT is there a code or something so you can "fade" out the compensation. that compensation makes the Z move around and can make ugly prints.

                            I had that on marlin with my mks board. 3mm was the compensation Then it dont compensate anymore and the print is level.
                            I have not tried that gcode that fades out in Marlin on my Duet. And i am not on my computer now so i cant see what that gcode is.

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                            • iDeveloundefined
                              iDevelo
                              last edited by

                              @HenrikM:

                              That wiring is correct.
                              My bltouch is working perfect and i tried a extreme bed compensation with 1.5 mm high on one side and 1.5 mm low on other side and i got a Perfect first layer 🙂

                              BUT is there a code or something so you can "fade" out the compensation. that compensation makes the Z move around and can make ugly prints.

                              I had that on marlin with my mks board. 3mm was the compensation Then it dont compensate anymore and the print is level.
                              I have not tried that gcode that fades out in Marlin on my Duet. And i am not on my computer now so i cant see what that gcode is.

                              Sure is M376 http://reprap.org/wiki/G-code#M376:_Set_bed_compensation_taper

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                              • HenrikMundefined
                                HenrikM
                                last edited by

                                Great! Thanks. Will try it later 🙂

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                                • toshiundefined
                                  toshi
                                  last edited by

                                  Hello,
                                  I wirred my Bltouch yesterday thanks to this thread, it's the new version with something to cut for 3.3V output. I can extend, retract, and simulate the bed contact with my finger with no limit.
                                  But, there is always a problem =), When I launch a G32 with the following code (grid or points), the fourth point is always skipped with the error : ''Error: Z probe already triggered at start of probing move".
                                  Do you have an idea ?

                                  Config:

                                  M558 P5 X0 Y0 Z5 H10 F200 T5000
                                  M307 H3 A-1 C-1 D-1
                                  M574 E0 S0
                                  G31 X-30 Y-5 Z3.15 P25	
                                  
                                  

                                  Bed:

                                  M280 P3 S10 I1
                                  G4 P50
                                  
                                  ;**Mesh bed leveling
                                  ;G28 Z
                                  ;M557 X10:190 Y10:190 S36
                                  ;G29 S0
                                  
                                  ;**Point bed leveling
                                  G30 P0 X-12 Y12 Z-99999
                                  G30 P1 X-12 Y190 Z-99999
                                  G30 P2 X170 Y190 Z-99999
                                  G30 P3 X170 Y12 Z-99999 S0
                                  
                                  G4 P50
                                  M280 P3 S90 I1
                                  
                                  
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                                  • ThePigSlayerundefined
                                    ThePigSlayer
                                    last edited by

                                    Toshi, you should probably decrease your trigger height. 3.15 is an awfully big trigger height, and since your dive height is only 5 (in m558), your z axis only goes up from 3.15 to 5mm, which is too short of a z-lift after each probe, which makes the probe report that it is already trigger before the travel move.

                                    Your BL touch pin (the very tip) should be 2mm above the tip of your nozzle when retracted, which gives most people a trigger height of around 1.5mm. Your dive height of 5mm is normal, so either you need adjust your mount so you can lower your trigger height (by mounting the probe higher), or you miscalculated your trigger height. 3.15mm would be dangerously close to the height of the nozzle, and could catch during prints, so I think that it is more likely that you made a mistake when calculating the trigger height.

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                                    • toshiundefined
                                      toshi
                                      last edited by

                                      Thanks for you advises, I just finish to redesign my x carriage with 2.1mm différence between probe triggered and nozzle (tested), this program was with the initial mount, not optimized but worked. The issue was a wired cut inside the isolation thus a default.
                                      Now it's working and perfect, maybe tune the speed and hight to have a better repetability. Some times at least 1 point is wrong and the 1rst layer too.

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                                      • drmaestroundefined
                                        drmaestro
                                        last edited by

                                        Hi,

                                        Would it be ok if I used 270 ohms or 220 ohms as resistor, as I don't have 240 ohms.

                                        Thanks

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                                        • Sniffleundefined
                                          Sniffle
                                          last edited by

                                          @drmaestro:

                                          Hi,

                                          Would it be ok if I used 270 ohms or 220 ohms as resistor, as I don't have 240 ohms.

                                          Thanks

                                          I would pull out a meter and test each of them since they have +-5%

                                          If you have 4 1kohm resistors you can run them in parallel and get ~250ohms. again if you have something close meter them and use the closest to 240ohms

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                                          • claustroundefined
                                            claustro
                                            last edited by

                                            I am trying to setup bltouch and auto bed compensation
                                            I added at config.g
                                            [c];*** BLTouch
                                            M307 H3 A-1 C-1 D-1
                                            M558 P5 X0 Y0 Z1 H3 F200 T5000
                                            G31 P100 X0 Y-20 Z2[/c]

                                            and

                                            [c]M557 X10:290 Y10:290 S70[/c]

                                            Checked the trigger height as described in the wiki but now I am lost.
                                            Where to put G29 command ? Should I use a bed.g config file? where I setup the probing sequence?

                                            Also
                                            I am trying to home the axis using bl touch
                                            X and Y home correctly but I can't homing Z axis 'cos bltouch don't deploy during the procedure ( it deploy correctly if I launch the deploy command through console)
                                            My endstop line in config.g is this
                                            [c]M574 X1 Y2 Z0 S0[/c]
                                            Iam using makerboat endstop on x and y and bltouch on z
                                            Thank you

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