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    First Layer and Extrusion Problems

    Scheduled Pinned Locked Moved
    Tuning and tweaking
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    • fcwiltundefined
      fcwilt @Veti
      last edited by

      @Veti said in First Layer and Extrusion Problems:

      @fcwilt said in First Layer and Extrusion Problems:

      How can we be sure the pitch is 8mm?

      i cant, but there is a very high chance that isnt a M8 metric lead screw.

      Agreed given the 8mm is a common value.

      Frederick

      Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

      Vetiundefined 1 Reply Last reply Reply Quote 0
      • Vetiundefined
        Veti @fcwilt
        last edited by

        @fcwilt

        but you are right.

        @Frederik there are several things you have been asked that you have not given an answer to.

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        • Frederikundefined
          Frederik @fcwilt
          last edited by

          @fcwilt you are right it was a wrong setting from yesterday. its a normal tr8 4 stop with 8 Lead Spindle

          1 Reply Last reply Reply Quote 1
          • Frederikundefined
            Frederik
            last edited by

            i had to test your tips one after the other.... now my z offset is working as it should.

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            • Frederikundefined
              Frederik
              last edited by

              my bed.g File at the Moment:

              ; bed.g
              ; called to perform automatic bed compensation via G32
              ;
              ; generated by RepRapFirmware Configuration Tool v3.1.7 on Wed Nov 18 2020 18:04:17 GMT+0100 (Mitteleuropäische Normalzeit)

              M561 ; clear any bed transform

              ;Probe 3-point

              G30 P0 X330 Y240 Z-9999 ; Front Left
              G30 P1 X150 Y0 Z-9999 ; Middle Back
              G30 P2 X0 Y248 Z-9999 S3 ; Front Right and compensate 3mm

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              • Frederikundefined
                Frederik
                last edited by

                and this my actual homez.g File:

                ; homez.g
                ; called to home the Z axis
                ;
                ; generated by RepRapFirmware Configuration Tool v3.1.7 on Wed Nov 18 2020 18:04:17 GMT+0100 (Mitteleuropäische Normalzeit)

                G91 ; relative positioning
                G1 H2 Z5 F6000 ; lift Z relative to current position
                G90 ; absolute positioning
                G1 X200 Y200 F6000 ; go to first probe point
                G30 ; home Z

                fcwiltundefined 1 Reply Last reply Reply Quote 0
                • Vetiundefined
                  Veti
                  last edited by

                  so run a G32 and then G29 and post the new picture.

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                  • fcwiltundefined
                    fcwilt @Frederik
                    last edited by fcwilt

                    @Frederik said in First Layer and Extrusion Problems:

                    and this my actual homez.g File:

                    ; homez.g
                    ; called to home the Z axis
                    ;
                    ; generated by RepRapFirmware Configuration Tool v3.1.7 on Wed Nov 18 2020 18:04:17 GMT+0100 (Mitteleuropäische Normalzeit)

                    G91 ; relative positioning
                    G1 H2 Z5 F6000 ; lift Z relative to current position
                    G90 ; absolute positioning
                    G1 X200 Y200 F6000 ; go to first probe point
                    G30 ; home Z

                    You can at this point add:

                    G32
                    G1 X200 Y200 F6000
                    G30

                    The reason for the last two lines is the bed leveling can change your Z=0 datum it needs to be set again - just to be safe.

                    If you wish to probe at the actual center of the bed you will need to adjust the G1 X and Y values to compensate for the probe X and Y offsets.

                    To insure that I always move to the same point with I need to do a G30 I have a macro file "centerprobe.g" that contains this:

                    G90                                                                          ; absolute
                    G1 Z5 F1200                                                                  ; move to probing height
                    G1 X{-sensors.probes[0].offsets[0]}, Y{-sensors.probes[0].offsets[1]}, F6000 ; move to bed center for probing
                    

                    The second G1 command takes advantage of the v3 firmware to access the probe X and Y offset values.

                    BUT the way my printer is setup the Z axis is already homed whenever I execute this macro so the G1 Z5 command will work.

                    Frederick

                    Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

                    Frederikundefined 1 Reply Last reply Reply Quote 0
                    • Frederikundefined
                      Frederik @fcwilt
                      last edited by

                      @fcwilt ok, i will add these commands

                      fcwiltundefined 1 Reply Last reply Reply Quote 0
                      • fcwiltundefined
                        fcwilt @Frederik
                        last edited by

                        @Frederik

                        I was editing while you were posting - please check to see if you saw all of what meant to post.

                        Frederick

                        Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

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                        • Frederikundefined
                          Frederik
                          last edited by

                          i am back,

                          i editet my Files, generatet the macro file centerprobe.g
                          and insert the additonal G32 in my homez.g

                          the x and y position is now with the probe offsets the center of my build area.

                          ; homez.g
                          ; called to home the Z axis
                          ;
                          ; generated by RepRapFirmware Configuration Tool v3.1.7 on Wed Nov 18 2020 18:04:17 GMT+0100 (Mitteleuropäische Normalzeit)
                          G91 ; relative positioning
                          G1 H2 Z5 F6000 ; lift Z relative to current position
                          G90 ; absolute positioning
                          G32
                          G1 X165 Y187 F6000 ; go to first probe point
                          G30 ; home Z by True bed leveling 3 points in bed.g

                          fcwiltundefined 1 Reply Last reply Reply Quote 0
                          • fcwiltundefined
                            fcwilt @Frederik
                            last edited by

                            @Frederik said in First Layer and Extrusion Problems:

                            i editet my Files, generatet the macro file centerprobe.g
                            and insert the additonal G32 in my homez.g

                            Given you are new to this I should have mentioned that to use the "centerprobe.g" macro you need to put M98 P"centerprobe.g" into your code whenever you want to move the probe to the center of the bed.

                            So instead of the G1 command preceeding the G30 you would have M98 P"centerprobe.g" BUT you will need to comment out the G1 line in "centerprobe.g" that tries to move on the Z axis since that line assumes Z is already homed.

                            Frederick

                            Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

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                            • Frederikundefined
                              Frederik
                              last edited by

                              ok thank you, i try it and post the results in a moment

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                              • Vetiundefined
                                Veti
                                last edited by

                                you should really keep your bed.g and homing files as simple as possible.
                                then use a macro to combine the actions.

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                                • A Former User?
                                  A Former User
                                  last edited by A Former User

                                  Given that it's a core-xy which normally homes one axis after the other (normally x then y) after x homes you can tell x to place the nozzle to the centre of the bed and then home y and again tell y to go to the centre of the bed no extra files or code required then home z can be executed as normal from the centre of the bed

                                  fcwiltundefined 1 Reply Last reply Reply Quote 0
                                  • A Former User?
                                    A Former User
                                    last edited by A Former User

                                    ; bed.g
                                    ;
                                    ; called to perform automatic bed compensation via G32
                                    ;
                                    G28                         ; Home all
                                    G30 P0 X2 Y-2 Z-99999       ; Probe near the front left lead-screw
                                    G30 P1 X152 Y278 Z-99999    ; Probe near the rear lead screw 
                                    G30 P2 X290 Y-2 Z-99999 S3  ; Probe near the front right lead-screw
                                    G30 P0 X2 Y-2 Z-99999       ; Probe near the front left lead-screw (Second Pass)
                                    G30 P1 X152 Y278 Z-99999    ; Probe near the rear lead screw (Second Pass)
                                    G30 P2 X290 Y-2 Z-99999 S3  ; Probe near the front right lead-screw (Second Pass) 
                                    G91                         ; Switch to relative positioning moves
                                    G1 H2 Z5 F8000              ; Drop the Z axis (the bed) by 5mm relative to its current position
                                    G90                         ; Revert back to absolute positioning moves
                                    G1 X160 Y155 F8000          ; Position the nozzle at the centre of the bed
                                    G30                         ; Probe and set the height as probed
                                    G29 S1 P"heightmap.csv"     ; Load the height map
                                    
                                    

                                    This is an operational bed.g file for a core-xy with x3 z axis lead screws

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

                                      @CaLviNx THank you 🙂 i will have a look and adjust mine accordingly

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

                                        @CaLviNx said in First Layer and Extrusion Problems:

                                        Given that it's a core-xy which normally homes one axis after the other (normally x then y) after x homes you can tell x to place the nozzle to the centre of the bed and then home y and again tell y to go to the centre of the bed no extra files or code required then home z can be executed as normal from the centre of the bed

                                        That is assuming you don't care if the probe is at the center of the bed.

                                        Because I want to probe the center of the bed I created the macro I mentioned which does the math required.

                                        Frederick

                                        Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

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

                                          @fcwilt said in First Layer and Extrusion Problems:

                                          That is assuming you don't care if the probe is at the center of the bed.

                                          Because I want to probe the center of the bed I created the macro I mentioned which does the math required.

                                          Frederick

                                          That is assuming that you DO care that the probe IS at the centre of the bed because you have already told x and y to put the nozzle/probe to the centre of the bed ready for z to home using the probe, this way NO extra macro is required, making it nice and simple.

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

                                            @CaLviNx said in First Layer and Extrusion Problems:

                                            That is assuming that you DO care that the probe IS at the centre of the bed because you have already told x and y to put the nozzle/probe to the centre of the bed ready for z to home using the probe, this way NO extra macro is required, making it nice and simple.

                                            Except you are not probing the center of the bed which I consider essential.

                                            Frederick

                                            Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

                                            A Former User? 1 Reply Last reply Reply Quote 0
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