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    Hesitations on the X and Y axis when using "Bed Mesh Compensation"

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    • Shotfireundefined
      Shotfire
      last edited by

      I have a Cartesian printer. There is a very slight multiple hesitations on the X and Y axis, extruder appears ok but is hard to see. At speeds less than 20mm/sec its really hard to visually see but can be seen as a little bit of extra extrusion causing a slight bulge in a long straight run where its building the wall of a box. At speeds above, lets say around 40mm/s to 100mm/s the hesitation is easily seen visually and heard, and can be felt by placing your finger on the carriages as they are moving. It only occurs when using "Bed Mesh Compensation". Works fine with "No Bed Compensation" and with "Auto Bed Compensation"

      https://youtu.be/t_yAEmRh_ig

      ; Configuration file for Duet WiFi (firmware version 1.17)
      ; executed by the firmware on start-up
      ;

      ; General preferences
      T0 ; Select first tool
      M111 S0 ; Debugging off
      G21 ; Work in millimeters
      G90 ; Send absolute coordinates…
      M82 ; Absolute Extruder moves (Cura)
      M555 P1 ; Set firmware compatibility to look like RepRapFirmare

      ; Axis - Config
      M208 X0 Y0 Z0 S1 ; Set axis minimum
      M208 X281 Y143 Z140 S0 ; Set axis maximum

      ; End-stops
      M574 X2 Y2 Z0 S0 ; Define active low and unused micro switches
      M558 P1 X0 Y0 Z1 H3 F200 T6000 ; Set Z probe type to un-modulated, the axes for which it is used and the probe + travel speeds

      ; Z - Probe
      G31 P500 X-16.6 Y-13.5 Z1.60 ; Set Z probe trigger value, Increase to move head closer to bed, offset and trigger height previous Z0.55

      ; Bed Compensation
      M557 X36.6:216 Y13:140 S20 ; Define mesh grid

      ; Drives
      M569 P0 S0 ; Drive 0 goes forwards
      M569 P1 S0 ; Drive 1 goes forwards
      M569 P2 S1 ; Drive 2 goes forwards
      M569 P3 S1 ; Drive 3 goes forwards
      ;M569 P4 S1 ; Drive 4 goes forwards
      M350 X16 Y16 Z16 E16 I1 ; Configure micro stepping with interpolation
      M92 X88.9 Y177.8 Z400 E400.0 ; Set steps per mm (Y is .9deg) (E is geared)
      M906 X800 Y1200 Z400 E800 I30 ; Set motor currents (mA) and motor idle factor in per cent
      M84 S30 ; Set idle timeout

      ; Movement - Speeds
      M566 X600 Y600 Z10 E30 ; Jerk - Set maximum instantaneous speed changes (mm/min)
      M203 X15000 Y15000 Z600 E1200 ; Set maximum speeds (mm/min)
      M201 X1000 Y1000 Z150 E4000 ; Set accelerations (mm/s^2)

      ; Heaters
      M143 H0 S125 ; Set Maximum Bed Temperature
      M143 S260 ; Set maximum heater temperature to 260C
      M307 H0 A222.9 C886.5 D4.5 B0 ; Use PID on bed heater (may require further tuning)
      M307 H1 A655.3 C237.6 D7.5 B0 P1.0 ; Use PID on heater 1 (may require further tuning)
      M305 P0 T110000 B3988 C0 R4700 ; Set thermistor + ADC parameters for bed heater 0
      M305 P1 X200 ; Set PT100 Channel Heater 1
      M141 H2 ; heater 3 is the chamber heater
      M305 P2 R4700 T100000 B3950 ; heater 3 is monitored by a 100K thermistor with B=3950 and a 4.7K series resistor
      M301 H2 P-1 ; use bang-bang control for the chamber heater

      ; Tools
      M563 P0 D0 H1 ; Define tool 0
      G10 P0 X0 Y0 Z0 ; Set tool 0 axis offsets
      G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C

      ; Network
      M550 PReplicator2x ; Set machine name
      M552 P0.0.0.0 S1 ; Enable network and acquire dynamic address via DHCP

      ; Fans
      M106 P0 S0 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
      M106 P1 S1 I0 F500 H1 T45 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
      M106 P2 S1 I0 F500 H1 T45 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on

      ;M106 P0 S0 H-1 F100 ; Set fan 0 , PWM signal inversion and frequency. Thermostatic control is turned off - FAN
      ;M106 P1 S1 H1 T50 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on - HS
      ;M106 P2 S1 H0 T60 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on - Motor

      ; Custom settings are not configured

      ; Miscellaneous
      M912 P0 S-8.5 ; CPU Temperature Calibration

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      • whosrdaddyundefined
        whosrdaddy
        last edited by

        This is interesting, I noticed this behavior too but did not link it to the mesh bed leveling.
        I have noticed this when printing a circle, I always get a "stitch line" when the printer hesitates, need to test your findings…

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        • elmoretundefined
          elmoret
          last edited by

          Perhaps your z-axis accelerations are holdign back X/Y movements while the Z-axis compensates?

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          • dc42undefined
            dc42 administrators
            last edited by

            It's either the Z acceleration or Z jerk limit holding it back. Your Z jerk limit of 10mm/min does look very low.

            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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            • Shotfireundefined
              Shotfire
              last edited by

              DC,
              What settings would you suggest for Acc & Jerk?
              Thanks

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              • dc42undefined
                dc42 administrators
                last edited by

                Try increasing Z jerk to 100.

                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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                • Shotfireundefined
                  Shotfire
                  last edited by

                  Thanks DC, Changing Z Jerk to 100 fixed it

                  Is there anything else in my config that you see that might be a problem now or in the future, maybe something is borderline and is working now but could cause a problem when printing something other than the simple box I'm doing now?

                  Thanks

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