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    BLTouch working

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    Duet Hardware and wiring
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    • FrankNPrinterundefined
      FrankNPrinter
      last edited by

      Thanks David, I was printing test cubes and stuff late into the night. Cant wait to get this dialed in! I will give that a try and let you know how i make out.

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      • Miasmictruthundefined
        Miasmictruth
        last edited by

        I have had the BLTouch not fire the pin a couple times when setting it up. What seemed to have happened is that it faulted before trying to fire the pin so nothing happens, that the Duet does not know that it didn't fire.

        This is relatively easy to resolve by sending a reset code, but here is my dilemma. What happens if the probe is faulted and you when you try to home?

        This happened while I was sitting there so was able to prevent damage no idea why the probe was faulted, but what if I fail to notice in time the next time..

        Anyway I was curious if anyone has seen this issue and what safeguards they have used to prevent catastrophe

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        • Sniffleundefined
          Sniffle
          last edited by

          if it homes but then fails to activate for the probe it will only go the dive height distance before erroring but on the homing process i believe its just a bed crash.

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          • FrankNPrinterundefined
            FrankNPrinter
            last edited by

            i noticed my bltouch fires twice at start up. if you are at z home, the probe hits the bed and errors out. no idea if this is what is causing your issueโ€ฆ BTW, i also noticed loose connection on the 50 pin jack causing bltouch to go on and off sometimes during movement. I hope you have better connectors than i do.

            To whomever was asking for a copy of my config, sorry but my pc died and i am running on an old xp system at the moment soat a standstill as far as being able to work on the printer. Hope to have resolved soon but definitely intend on sharing as soon as i am back up. I also appear to have a bizarre z movement issue and am wondering if others wired dual motors on y and z of if they are using an expansion of some sort? left y motor never even gets warm but right does.

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            • Miasmictruthundefined
              Miasmictruth
              last edited by

              I don't actively have an issue, I am just want to prevent a possible future issue.

              The frame of my printer in acrylic and if I had to bet which would give first the steppers or the acrylic I wouldn't bet on the acrylic even though its high quality stuff.

              One thing I am thinking of is sending a reset pulse before I start but still that doesn't guarantee anything.

              Another thing might be adding some sort of emergency stop on the bed somehow. If it deflects the rods when it hits the hotend I don't think it would hurt much, but it bowed the acrylic a little before I was able to stop it (again this is when I was still setting it up)

              In any case while the BLTouch is awesome there is little to no security with it.

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              • iDeveloundefined
                iDevelo
                last edited by

                What have you guys found the best distance is from the end of the nozzle to the bottom of the bltouch (not the pin)?

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                • Sniffleundefined
                  Sniffle
                  last edited by

                  the bltouch documentation suggests 1.5mm if i remember correctly

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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 โ€“----------Z probe GND
                                  OUT--------------Z probe IN

                                  3wires cable
                                  +5Vโ€“------------+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 ๐Ÿ™‚

                                          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 ๐Ÿ™‚

                                            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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