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  1. #1

    Awful prints after replacing gantry carriages

    Hi,
    I have an Ender 4 that I have converted to CoreXY with a mod from thingiverse. It looks like this:
    3D printer half size.jpg
    I replaced the gantry carriages (the blue parts) on it because they were heat-damaged after the the printer was transported in my car (it sat in the sun and the car heated up). Even with the damage, my printer was making halfway decent prints, but I wanted to restore full functionality.
    After replacing them though, the prints were much worse. I've never seen anything like it. Here's a pic:
    Gantry problem half size.jpg
    I'm stumped on this one.
    Just FYI, I'm using a Duet 2 controller board with this printer.
    Any ideas?
    Thanks

  2. #2
    I tightened everything down and it helped a little. Here's a better view of a cube I printed after tightening:
    Gantry Problem 2 half size.jpg
    Here's a single layer:
    Gantry Problem 3.jpg
    So it isn't a "symmetrical" problem...

    These are the settings in my config.g file, if you'd like to take a look.

    Code:
    ; Configuration file for Duet WiFi (firmware version 2.03)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v2.1.2 on Tue Nov 05 2019 14:13:07 GMT-0800 (Pacific Standard Time)
    
    ; General preferences
    G90                                                ; send absolute coordinates...
    M83                                                ; ...but relative extruder moves
    M550 P"Ender 4 CoreXY"                             ; set printer name
    
    M667 S1                                            ; select CoreXY mode
    
    ; Network
    M552 S1                                            ; enable network
    M586 P0 S1                                         ; enable HTTP
    M586 P1 S1                                         ; enable FTP
    M586 P2 S0                                         ; disable Telnet
    
    ; Drives
    M569 P0 S1                                         ; physical drive 0 goes forwards
    M569 P1 S1                                         ; physical drive 1 goes forwards
    M569 P2 S1                                         ; physical drive 2 goes forwards
    M569 P3 S1                                         ; physical drive 3 goes forwards
    M584 X0 Y1 Z2 E3                                   ; set drive mapping
    ;M350 X256 Y256 Z256 E256 I0                            ; configure 256x microstepping without interpolation
    ;M92 X1288.48 Y1289.6 Z6735.68 E1376                ; set steps per mm (256x microstepping)
    M350 X32 Y32 Z32 E32 I0                            ; configure 32x microstepping without interpolation
    M92 X161.06 Y161.20 Z841.96 E172.00                ; set steps per mm (32x microstepping)
    ;M566 X900.00 Y900.00 Z12.00 E120.00                ; set maximum instantaneous speed changes (mm/min)
    M203 X18000.00 Y18000.00 Z600.00 E1500.00          ; set maximum speeds (mm/min)
    ;M201 X3000.00 Y3000.00 Z3000.00 E3000.00           ; set accelerations (mm/s^2)
    M906 X800 Y800 Z800 E800 I11                       ; 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 X215 Y210 Z310 S0                             ; set axis maxima
    
    ; Endstops
    M574 Y1 S0                                         ; set active low and disabled endstops
    M574 X1 Z1 S1                                      ; set active high endstops
    
    ; Z-Probe
    M558 P5 H5 F200 T6000                              ; set Z probe type to switch and the dive height + speeds
    G31 P500 X30 Y0 Z2.53                              ; set Z probe trigger value, offset and trigger height
    M556 S50 X0 Y0 Z0                                  ; set orthogonal axis compensation parameters
    M557 X50:205 Y10:200 S18                           ; define mesh grid
    
    ; Heaters
    M307 H0 B0 S1.00                                   ; disable bang-bang mode for the bed heater and set PWM limit
    M305 P0 T100000 B4138 R4700                        ; set thermistor + ADC parameters for heater 0
    M143 H0 S110                                       ; set temperature limit for heater 0 to 110C
    M305 P1 T100000 B4138 R4700                        ; set thermistor + ADC parameters for heater 1
    M143 H1 S300                                       ; set temperature limit for heater 1 to 300C
    
    ; Fans
    M106 P0 C"Nozzle" S0 I0 F500 H-1                   ; set fan 0 name, value, PWM signal inversion and frequency. Thermostatic control is turned off
    M106 P1 C"Heatsink" S0 I0 F500 H1 T150              ; set fan 1 name, value, PWM signal inversion and frequency. Thermostatic control is turned on
    M106 P2 C"LEDs" S0 I0 F3000 H-1                    ; set fan 2 name, value, PWM signal inversion and frequency. Thermostatic control is turned off
    
    ; Tools
    M563 P0 D0 H1 F1:0                                 ; 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
    M558 Z1 I1                                                  ;Invert Z probe logic
    M307 H1 A528.0 C260.4 D7.5 S0.80 V24.2 B0          ;Hotend PID tuning
    M307 H0 A111.0 C1272.4 D16.3 S1.00 V23.7 B0        ;Bed PID Tuning
    ;M376 H3                                            ; Hnnn Height (mm) over which to taper off the bed compensation
    M929 log.txt                                                   ;Enable Event Logging
    M566 X200 Y200 Z24.00 E150.00              ; set maximum instantaneous speed changes (Jerk) (mm/min)
    M201 X2875 Y2875 Z1200 E3000.00           ; set accelerations (mm/s^2)
    ;M203 X6000.00 Y6000.00 Z720.00 E1200.00 ; set maximum speeds (mm/min)    (Defaults)
    
    ; Miscellaneous
    M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss

  3. #3
    Sorry for yet another post, but I thought posting my print settings would be helpful. Wish I had thought of all this for the first post!
    Anyway, Here's the cura profile I was using, before and after the gantry replacement.
    Code:
    PK       ! (:»ËŽ  Ž     custom_draft_quality_custom #2[general]
    version = 4
    name = ABS #2
    definition = fdmprinter
    
    [metadata]
    quality_type = draft
    setting_version = 10
    type = quality_changes
    intent_category = default
    
    [values]
    adaptive_layer_height_enabled = False
    adaptive_layer_height_variation = 0.15
    adhesion_type = skirt
    bridge_settings_enabled = True
    bridge_wall_min_length = 3
    default_material_bed_temperature = 108
    layer_height = 0.2
    layer_height_0 = 0.3
    material_bed_temperature = 100
    material_bed_temperature_layer_0 = 100
    print_sequence = one_at_a_time
    retraction_combing = noskin
    speed_slowdown_layers = 2
    support_enable = False
    support_type = buildplate
    travel_retract_before_outer_wall = True
    
    PK       ! écS            ,   custom_extruder_1_#3_draft_quality_custom #2[general]
    version = 4
    name = ABS #2
    definition = fdmprinter
    
    [metadata]
    quality_type = draft
    setting_version = 10
    position = 0
    type = quality_changes
    intent_category = default
    
    [values]
    alternate_extra_perimeter = True
    bottom_thickness = =top_bottom_thickness
    bridge_fan_speed = 50
    bridge_fan_speed_2 = 4
    bridge_fan_speed_3 = 4
    brim_line_count = =math.ceil(brim_width / (skirt_brim_line_width * initial_layer_line_width_factor / 100.0))
    brim_width = 3.5
    coasting_enable = False
    cool_fan_enabled = True
    cool_fan_speed = 0
    cool_fan_speed_0 = 0
    cool_fan_speed_max = 0
    cool_fan_speed_min = =cool_fan_speed
    default_material_print_temperature = 245
    filter_out_tiny_gaps = False
    infill_before_walls = True
    infill_overlap = 30
    infill_pattern = cubic
    infill_sparse_density = 30
    ironing_flow = 5
    ironing_only_highest_layer = False
    ironing_pattern = zigzag
    layer_start_x = 0
    layer_start_y = 0
    line_width = =machine_nozzle_size
    material_diameter = 1.69
    material_flow = 105
    material_flow_layer_0 = 100
    material_print_temperature = 250
    optimize_wall_printing_order = True
    outer_inset_first = True
    retract_at_layer_change = True
    retraction_amount = 3
    retraction_hop = 0.4
    retraction_hop_enabled = True
    retraction_hop_only_when_collides = True
    retraction_speed = 45
    roofing_layer_count = 1
    skin_overlap = 15
    skirt_brim_speed = =speed_layer_0
    skirt_gap = 3
    skirt_line_count = 3
    speed_equalize_flow_enabled = False
    speed_layer_0 = 15
    speed_print = 60
    speed_print_layer_0 = =speed_layer_0
    speed_travel = 150
    speed_travel_layer_0 = 20
    speed_wall_x = =speed_wall * 2
    support_connect_zigzags = False
    support_infill_rate = 12
    top_bottom_pattern = lines
    top_bottom_thickness = 1.2
    top_layers = =0 if infill_sparse_density == 100 else math.ceil(round(top_thickness / resolveOrValue('layer_height'), 4))
    travel_avoid_supports = True
    travel_compensate_overlapping_walls_0_enabled = =travel_compensate_overlapping_walls_enabled
    wall_line_count = =1 if magic_spiralize else max(1, round((wall_thickness - wall_line_width_0) / wall_line_width_x) + 1) if wall_thickness != 0 else 0
    wall_line_width = =line_width
    wall_line_width_x = =wall_line_width
    wall_thickness = 1.2
    xy_offset = 0
    z_seam_corner = z_seam_corner_weighted
    z_seam_relative = True
    z_seam_type = back
    zig_zaggify_infill = =infill_pattern == 'cross' or infill_pattern == 'cross_3d'
    Also, here's a print before gantry replacement (with the semi-melted gantries that sat in a hot car). Not incredible, but not nothing like what I get now.
    Gantry Problem 4 half size.jpg
    Any help would be greatly appreciated!
    Thanks!

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