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    Command on layer change

    Duet Hardware and wiring
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    • taconite
      taconite last edited by

      Hey guys,

      I am really new to this forum and I hope I haven't missed a similar topic. I want to build a delta printer with a duetwifi.
      Is it possible to detect a layer change and move another stepper (other than the 3 for the Delta Movement) xx-Steps (according to the layer hight --> 0.1mm 0.2mm 0.3mm ....) possible application for my big printer and a camera that is moving up as the layers are.

      Thanks guys for the help

      Best Regards
      taconite

      wilriker 1 Reply Last reply Reply Quote 0
      • wilriker
        wilriker Moderator @taconite last edited by

        @taconite I am not a 100% certain but I think you could define another stepper driver as being part of the Z-axis. This way it should go up together when all other motors perform a Z movement. But I have no experience with deltas, so better wait for someone to confirm.

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        • ampex_fhm
          ampex_fhm last edited by

          this should be possible by using the layer change gcode functionality provided by, e.g. slic3r. Just add your stepper, define it as an additional, non extruder axis (UVWABC) and move the axis in your layer change code.

          If your slicer does not support this you may be able to insert the move commands by searching for the comments inserted by your slicer (e.g. ";layer 3") and adding the move commands there.

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

            @ampex_fhm thanks for your reply: Do you know if this feature is available in cura (I am currently using 2.6.2). the best thing would be an "automatic" feature that I don't have to add manually. is the duet sending a "change layer" command or something?

            EDIT: found this https://github.com/Ultimaker/Cura/issues/593 --> it's a solution for "Custom G Code inserted at layer change" - it's a Postprocessing Plugin for cura; anyhow it would be awesome if there would be "automatic" solution that I don't have to add manually

            hariedo created this issue in Ultimaker/Cura

            closed Custom G Code inserted at layer change #593

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

              There is already another firmware request to support a modified delta kinematics that moves in line with the Z height, and I expect to implement this soon (perhaps in firmware 2.02). You need to consider how you will home this extra axis - presumable with its own homing switch. Meanwhile you can create an additional U axis using the M564 command and use a post-processing command to add G1 U commands at layer changes. This may be the best approach anyway, to avoid the camera hopping with each Z-hop.

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              • taconite
                taconite last edited by

                awesome thanks @dc42 . Yes you are absolutly right - I planned to home it with an extra homing switch. Again - Thank you for the help!

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

                  @taconite the layer change post processing feature in Cura 3.4 is quite good actually. Just FYI.

                  taconite 1 Reply Last reply Reply Quote 1
                  • taconite
                    taconite @Phaedrux last edited by taconite

                    @phaedrux okay, and how do I use it? Search and replace?
                    " Ghostkeeper commented on 16 Jan 2016 (on github) (https://github.com/Ultimaker/Cura/issues/593)

                    At every layer change, a comment is inserted that says: ;LAYER: <layer number>. This can be used to accurately detect layer changes, as long as CuraEngine is used as slicer.
                    "

                    So at the postprocessing:
                    search: ;LAYER:
                    replace: G1 U10 ;LAYER:

                    Seems like its working:
                    ....
                    ;LAYER_COUNT:60
                    G1 U50;LAYER:0
                    M107
                    G0 F30000 X86.763 Y87.334 Z0.1
                    G0 X87.138 Y86.962
                    ....

                    Do I need a return so that it looks like?
                    G1 U50
                    ;Layer:0

                    hariedo created this issue in Ultimaker/Cura

                    closed Custom G Code inserted at layer change #593

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

                      @taconite I don't think the return will matter at all since it's behind a comment ( ; ) anyway.

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

                        I'm using this to insert a few command on each layer change:
                        https://github.com/Kriechi/DuetRRF-timelapse/blob/master/TimelapseLayerChange.py

                        1 Reply Last reply Reply Quote 2
                        • resam
                          resam last edited by

                          I also just published a full tool to take snapshot pictures on every layer change, see https://forum.duet3d.com/topic/6058/timelapse-pictures-videos-with-duet-and-webcam-on-layer-change

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

                            @resam very nice! A total stupid question but how do I add your script to the cura post-rocessing plugin?

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

                              @taconite you put the TimelapseLayerChange.py file into the scripts folder of you current Cura version:

                              ~/Library/Application Support/cura/3.4/scripts on macOS,
                              C:\Users\<username>\AppData\Roaming\cura\3.4\scripts on Windows,
                              /home/<username>/.local/share/cura/3.4/scripts on Linux.

                              Then restart Cura, and it should be available to be added in the PostProcessing GUI.

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

                                hugh thanks to all of you!!!

                                1 Reply Last reply Reply Quote 0
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