Prints leaning/slanting backwards



  • Hi all,

    Bit of a strange one for me here. I have finally managed to get to the point where I can actually print (it's a big deal for me! 😊).

    I have started with calibration cubes, but though I have gradually managed to improve the overall quality, my prints are leaning backwards.

    It started off quite severe until I slightly reduced Y steps per mm (160 to 150), but I'm concerned that if I reduce much further I will screw my whole print geometry. The lean is reduced now, but definitely still there.

    I have gone to great lengths to ensure my bed is as level as possible - does anyone have any other advice?

    Can't get photos or files right now, but will upload later if needed.



  • @Harrynice, can you post a picture?

    Is it possible that your Z axis is not perpendicular to your X/Y?



  • @zapta Second this. In general any skewing of this nature tends to be due to skew in the hardware setup. Get an engineer's square and check angles of the different sides of the cube, and if the printer geometry allows, check the same between the axes.



  • Hey - thanks for the responses!

    I am attaching a few different images of the most recent cube to show the lean:

    20200613_115350.jpg

    20200613_115401.jpg

    20200613_115427.jpg

    As you can see, it seems to start off straight and develop the lean after about 1/5th of the print.

    I shall check angles on the frame and hardware (I only have spirit levels and an inclinometer) and see if I can spot anything.

    Could this be anything to do with my config?

    ; Configuration file for Duet WiFi (firmware version 3)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v3.1.1 on Wed Jun 03 2020 22:59:46 GMT+0100 (British Summer Time)
    
    ; General preferences
    G90                                                ; Send absolute coordinates...
    M83                                                ; ...but relative extruder moves
    
    ;Network
    M552 S1                                            ; enable network
    M550 P"###"                                    ; set printer name
    M551 P"###"                                   ; set password
    M552 P192.168.1.13                                 ; set IP address and enable network
    M554 P192.168.1.1                                  ; Gateway (not used yet)
    M553 P255.255.255.0                                ; Netmask
    M586 P0 S1                                         ; enable HTTP
    M586 P1 S1                                         ; enable FTP
    M586 P2 S0                                         ; disable Telnet
    
    ;PanelDue
    M575 P1 B57600 S1                                  ; Set auxiliary serial port baud rate and require checksum (for PanelDue)
    
    ; Drives
    M564 H0                                            ; allow axis movement without homing
    M569 P0 S1                                         ; physical drive 0 goes forwards
    M569 P1 S1                                         ; physical drive 1 goes forwards
    M569 P2 S0                                         ; physical drive 2 goes backwards
    M569 P3 S0                                         ; physical drive 3 goes backwards
    M584 X0 Y1 Z2 E3                                   ; set drive mapping
    M350 X16 Y16 Z16 E16 I1                            ; configure microstepping with interpolation
    M92 X160.00 Y150.00 Z800.00 E837.00                ; set steps per mm
    M566 X500.00 Y500.00 Z12.00 E100.00                ; set maximum instantaneous speed changes (mm/min)
    M203 X1500.00 Y1500.00 Z400.00 E300                ; set maximum speeds (mm/min)
    M201 X800.00 Y800.00 Z240.00 E300.00               ; set accelerations (mm/s^2)
    M906 X1000 Y1000 Z1000 E1000 I30                       ; set motor currents (mA) and motor idle factor in per cent
    M84 S30                                            ; Set idle timeout
    
    ; Axis Limits
    M208 X6 Y0 Z0 S1                                   ; set axis minimum/maximum
    M208 X190 Y200 Z180 S0                             ; set axis maximum
    
    ; Endstops
    M574 X1 S1 P"xstop"                               ; configure active-low endstop for low end on X via pin xstop
    M574 Y1 S1 P"ystop"                               ; configure active-low endstop for low end on Y via pin ystop
    M574 Z1 S1 P"zstop"                               ; configure active-low endstop for low end on Z via pin zstop
    
    ; Z-Probe
    M558 P0 H3 F120 T6000                              ; disable Z probe but set dive height, probe speed and travel speed
    ;M557 X0:200 Y0:200 S20                            ; define mesh grid
    
    ; Heaters
    M308 S0 P"bedtemp" Y"thermistor" T100000 B4138     ; configure sensor 0 as thermistor on pin bedtemp
    M950 H0 C"bedheat" T0                              ; create bed heater output on bedheat 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"e0temp" Y"thermistor" T100000 B4138      ; configure sensor 1 as thermistor on pin e0temp
    M950 H1 C"e0heat" T1                               ; create nozzle heater output on e0heat and map it to sensor 1
    M307 H1 B0 S1.00                                   ; disable bang-bang mode for heater  and set PWM limit
    
    ; Fans
    M950 F0 C"fan0" Q500                           ; create fan 0 on pin fan0 and set its frequency
    M106 P0 S0 H1 T35                              ; set fan 0 value. Thermostatic control is turned on
    M950 F1 C"fan1" Q500                           ; create fan 1 on pin fan1 and set its frequency
    M106 P1 S0.5 H-1                               ; set fan 1 value. Thermostatic control is turned off
    M950 F2 C"fan2" Q500                           ; create fan 2 on pin fan2 and set its frequency
    M106 P2 S1 H-1                                 ; set fan 2 value. Thermostatic control is turned off
    
    ; 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
    
    ; Misc
    M501                                               ; read stored parameters
    
    ; Custom settings are not defined
    
    
    

  • administrators

    @Harrynice said in Prints leaning/slanting backwards:

    It started off quite severe until I slightly reduced Y steps per mm (160 to 150),

    The steps/mm you use should be calculated, not tweaked. this one is good:
    https://blog.prusaprinters.org/calculator_3416/



  • @T3P3Tony Hi, I did calculate them initially on the reprap configurator, but Y was slightly out of whack (possibly due to belt or build).

    An adjustment of -10 steps per mm seems to have worked perfectly, though I admit I know far less about this stuff than almost everyone here 🙂


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