jerky movement - mini 5+ v0.4 + SBC 3.2beta3.2



  • I'm getting jerky movement on fast non print travel moves.
    I can hear that the movements aren't one smooth continuous run.
    Here is my config.g

    ; Configuration file for Duet 3 (firmware version 3)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v3.1.4 on Tue Sep 22 2020 14:08:43 GMT+0100 (British Summer Time)
    
    ; General preferences
    G90                                          		; send absolute coordinates...
    M83                                          		; ...but relative extruder move
    
    ; Drives
    M569 P0.0 S0 D3 V40                                		; physical drive 0.0 goes forwards
    M569 P0.1 S1 D3 V40                                		; physical drive 0.1 goes forwards
    M569 P0.2 S1 D3 V40                               		; physical drive 0.2 goes forwards
    M569 P0.3 S0 D3 V40                                		; physical drive 0.3 goes forwards
    M569 P0.4 S1 D3 V40                                		; physical drive 0.3 goes forwards
    M584 X0.0 Y0.1 Z0.2:0.3 E0.4                     		; set drive mapping
    M350 X16 Y16 Z16 E16 I1                      		; configure microstepping with interpolation
    M92 X100.00 Y100.00 Z400.00 E837            		; set steps per mm
    M566 X1000.00 Y1000.00 Z24.00 E120.00          		; set maximum instantaneous speed changes (mm/min)
    M203 X6000.00 Y6000.00 Z300.00 E1200.00      		; set maximum speeds (mm/min)
    M201 X1000.00 Y1000.00 Z200.00 E250.00          		; set accelerations (mm/s^2)
    M906 X1200 Y1200 Z1200 E1000 I30                 	; set motor currents (mA) and motor idle factor in per cent
    M84 S30                                      		; Set idle timeout
    
    ; Axis Limits
    M208 X0 Y0 Z0 S1                             		; set axis minima
    M208 X270 Y260 Z350 S0                       		; set axis maxima
    
    M671 X-130:400 Y150:150 S10
    
    ; Endstops
    M574 X1 S1 P"io1.in"
    M574 Y1 S1 P"io2.in"
    
    ; Z-Probe
    M558 P1 C"!io3.in" H2 A5 F120 T20000 S0.02       				; Set Z probe type to switch and the dive height + speeds
    G31 P1000 X-25 Y0 Z3.915												; Set Z probe trigger value, offset and trigger height
    M557 X15:230 Y15:230 S20                     		; define mesh grid
    
    ; Heaters
    M308 S0 P"temp0" Y"thermistor" T100000 B4092 		; configure sensor 0 as thermistor on pin temp0
    M950 H0 C"out2" T0                           		; create bed heater output on out0 and map it to sensor 0
    M307 H0 B0 S1.00                             		; disable bang-bang mode for the bed heater and set PWM limit
    M140 H0                                      		; map heated bed to heater 0
    M143 H0 S120                                 		; set temperature limit for heater 0 to 120C
    M308 S1 P"temp1" Y"thermistor" T100000 B4276 		; configure sensor 1 as thermistor on pin temp1
    M950 H1 C"out1" T1                           		; create nozzle heater output on out1 and map it to sensor 1
    M307 H1 B0 S1.00                             		; disable bang-bang mode for heater  and set PWM limit
    
    ; Fans
    ;############## Tool 0 Fans ##########################
    
    M950 F0 C"out6" Q500                    						; Create fan 0 on pin out3 and set its frequency
    M106 P0 S0 H-1                          						; Set fan 0 value. Thermostatic control is turned off
    M950 F1 C"out5" Q500                    						; Create fan 1 on pin out4 and set its frequency
    M106 P1 S1 H1 T45                        						; Set fan 1 value. Thermostatic control is turned on
    
    ; Tools
    M563 P0 D0 H1 F0                             		; 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
    
    ; Custom settings are not defined
    
    ;M918 P2                     ; enable ST7567-based 12864 display
    M150 X2 R255 U255 B255 S3   ; set all 3 LEDs to white
    
    M501                                         		; load saved parameters from non-volatile memory
    T0                                           		; select first tool
    
    M207 S5.0 R0.02 F2400 Z0.5
    
    M950 P0 Q500 C"out0"
    

    Pretty sure they weren't happening on earlier betas


  • administrators

    Are you calling macro files from daemon.g?



  • no. I do not currently have a daemon.g file


  • administrators

    Please run M122 once, then try to reproduce the jerky movement, and run M122 again once you could observe it. Then post the output here.



  • @chrishamm ok.
    Will do that once this print finishes


  • administrators

    @jay_s_uk said in jerky movement - mini 5+ v0.4 + SBC 3.2beta3.2:

    I'm getting jerky movement on fast non print travel moves.
    I can hear that the movements aren't one smooth continuous run.

    That's usually caused by using G29 bed compensation on an uneven bed with a low Z jerk value, especially when using a fine G29 mesh. You do have a very low Z jerk value in config.g.



  • @dc42 I'll try increasing the speed.
    It does happen as part of homing as well and the mesh compensation shouldn't be enabled then


  • administrators

    If the problem persists, please run M122 before doing this type of move (to reset the variables); then run it again after observing this behaviour and post the result here.



  • i've increased my jerk and it seems to have gone


  • Moderator

    I think I had requested the default Z jerk speed to be increased to 60 in the next update to the config tool. That usually seems like it's enough to prevent this issue from happening. 24 is pretty low.



  • @Phaedrux if I get chance to look at it (or even to remember to) I'll send a pull request in the morning




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