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Cura 14.03 Speed not changing


kevin-osborn
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Posted · Cura 14.03 Speed not changing

I wanted to do some speed experiments and I noticed that when I cranked up the speed in Cura, the prints still printed at the same speed.

Here's an excerpt from a 10mm cube at different speeds:

150mm/s:

 


;LAYER:79
G0 F9000 X110.60 Y116.90 Z8.20
;TYPE:WALL-INNER
G1 F1320 X110.60 Y108.10 E437.07423
G1 X119.40 Y108.10 E437.42623
G1 X119.40 Y116.90 E437.77823
G1 X110.60 Y116.90 E438.13023
G0 F9000 X110.20 Y117.30

Here's the same cube at 30mm/s

 


;LAYER:79
G0 F9000 X110.60 Y116.90 Z8.20
;TYPE:WALL-INNER
G1 F1320 X110.60 Y108.10 E437.07423
G1 X119.40 Y108.10 E437.42623
G1 X119.40 Y116.90 E437.77823
G1 X110.60 Y116.90 E438.13023
G0 F9000 X110.20 Y117.30

Going down to 5mm/s it does change. (I haven't determined at what speed it stops, but I'm suspicious of 1320, or 22mm/s)

 


;LAYER:79
G0 F9000 X110.60 Y116.90 Z8.20
;TYPE:WALL-INNER
G1 F300 X110.60 Y108.10 E437.07423
G1 X119.40 Y108.10 E437.42623
G1 X119.40 Y116.90 E437.77823
G1 X110.60 Y116.90 E438.13023
G0 F9000 X110.20 Y117.30

 

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    Posted · Cura 14.03 Speed not changing

    Here's the profile (150mm/s) The print speed was the only thing I changed in the above settings

     


    [profile]
    layer_height = 0.10
    wall_thickness = 0.8
    retraction_enable = True
    solid_layer_thickness = 0.6
    fill_density = 20
    nozzle_size = 0.4
    print_speed = 150
    print_temperature = 220
    print_temperature2 = 0
    print_temperature3 = 0
    print_temperature4 = 0
    print_bed_temperature = 70
    support = None
    platform_adhesion = None
    support_dual_extrusion = Both
    wipe_tower = False
    wipe_tower_volume = 15
    ooze_shield = False
    filament_diameter = 2.85
    filament_diameter2 = 0
    filament_diameter3 = 0
    filament_diameter4 = 0
    filament_flow = 100.0
    retraction_speed = 40.0
    retraction_amount = 4.5
    retraction_dual_amount = 16.5
    retraction_min_travel = 1.5
    retraction_combing = True
    retraction_minimal_extrusion = 0.02
    retraction_hop = 0.0
    bottom_thickness = 0.3
    object_sink = 0.0
    overlap_dual = 0.15
    travel_speed = 150.0
    bottom_layer_speed = 20
    infill_speed = 0.0
    inset0_speed = 0.0
    insetx_speed = 0.0
    cool_min_layer_time = 5
    fan_enabled = True
    skirt_line_count = 1
    skirt_gap = 3.0
    skirt_minimal_length = 150.0
    fan_full_height = 0.5
    fan_speed = 100
    fan_speed_max = 100
    cool_min_feedrate = 10
    cool_head_lift = False
    solid_top = True
    solid_bottom = True
    fill_overlap = 15
    support_type = Grid
    support_angle = 60
    support_fill_rate = 15
    support_xy_distance = 0.7
    support_z_distance = 0.15
    spiralize = False
    brim_line_count = 20
    raft_margin = 5
    raft_line_spacing = 1.0
    raft_base_thickness = 0.3
    raft_base_linewidth = 0.7
    raft_interface_thickness = 0.2
    raft_interface_linewidth = 0.2
    fix_horrible_union_all_type_a = True
    fix_horrible_union_all_type_b = False
    fix_horrible_use_open_bits = False
    fix_horrible_extensive_stitching = False
    plugin_config =
    object_center_x = -1
    object_center_y = -1
    [alterations]
    start.gcode = ;Sliced at: {day} {date} {time}
    ;Basic settings: Layer height: {layer_height} Walls: {wall_thickness} Fill: {fill_density}
    ;Print time: {print_time}
    ;Filament used: {filament_amount}m {filament_weight}g
    ;Filament cost: {filament_cost}
    ;M190 S{print_bed_temperature} ;Uncomment to add your own bed temperature line
    ;M109 S{print_temperature} ;Uncomment to add your own temperature line
    G21 ;metric values
    G90 ;absolute positioning
    M107 ;start with the fan off
    G28 X0 Y0 ;move X/Y to min endstops
    G28 Z0 ;move Z to min endstops
    G1 Z15.0 F{travel_speed} ;move the platform down 15mm
    G92 E0 ;zero the extruded length
    G1 F200 E3 ;extrude 3mm of feed stock
    G92 E0 ;zero the extruded length again
    G1 F{travel_speed}
    ;Put printing message on LCD screen
    M117 Printing...
    end.gcode = ;End GCode
    M104 S0 ;extruder heater off
    M140 S0 ;heated bed heater off (if you have it)
    G91 ;relative positioning
    G1 E-1 F300 ;retract the filament a bit before lifting the nozzle, to release some of the pressure
    G1 Z+0.5 E-5 X-20 Y-20 F{travel_speed} ;move Z up a bit and retract filament even more
    G28 X0 Y0 ;move X/Y to min endstops, so the head is out of the way
    M84 ;steppers off
    G90 ;absolute positioning
    start2.gcode = ;Sliced at: {day} {date} {time}
    ;Basic settings: Layer height: {layer_height} Walls: {wall_thickness} Fill: {fill_density}
    ;Print time: {print_time}
    ;Filament used: {filament_amount}m {filament_weight}g
    ;Filament cost: {filament_cost}
    ;M190 S{print_bed_temperature} ;Uncomment to add your own bed temperature line
    ;M104 S{print_temperature} ;Uncomment to add your own temperature line
    ;M109 T1 S{print_temperature2} ;Uncomment to add your own temperature line
    ;M109 T0 S{print_temperature} ;Uncomment to add your own temperature line
    G21 ;metric values
    G90 ;absolute positioning
    M107 ;start with the fan off
    G28 X0 Y0 ;move X/Y to min endstops
    G28 Z0 ;move Z to min endstops
    G1 Z15.0 F{travel_speed} ;move the platform down 15mm
    T1 ;Switch to the 2nd extruder
    G92 E0 ;zero the extruded length
    G1 F200 E10 ;extrude 10mm of feed stock
    G92 E0 ;zero the extruded length again
    G1 F200 E-{retraction_dual_amount}
    T0 ;Switch to the first extruder
    G92 E0 ;zero the extruded length
    G1 F200 E10 ;extrude 10mm of feed stock
    G92 E0 ;zero the extruded length again
    G1 F{travel_speed}
    ;Put printing message on LCD screen
    M117 Printing...
    end2.gcode = ;End GCode
    M104 T0 S0 ;extruder heater off
    M104 T1 S0 ;extruder heater off
    M140 S0 ;heated bed heater off (if you have it)
    G91 ;relative positioning
    G1 E-1 F300 ;retract the filament a bit before lifting the nozzle, to release some of the pressure
    G1 Z+0.5 E-5 X-20 Y-20 F{travel_speed} ;move Z up a bit and retract filament even more
    G28 X0 Y0 ;move X/Y to min endstops, so the head is out of the way
    M84 ;steppers off
    G90 ;absolute positioning
    support_start.gcode =
    support_end.gcode =
    cool_start.gcode =
    cool_end.gcode =
    replace.csv =
    switchextruder.gcode = ;Switch between the current extruder and the next extruder, when printing with multiple extruders.
    G92 E0
    G1 E-36 F5000
    G92 E0
    T{extruder}
    G1 X{new_x} Y{new_y} Z{new_z} F{travel_speed}
    G1 E36 F5000
    G92 E0
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    Posted · Cura 14.03 Speed not changing

    Hmm, good point, however I noticed it on a bigger print (cute-spocktipus) that was scaled to an inch tall.

    Now when I turn minimum layer time to 0, I still get a print estimate that stays the same unless I get to really low numbers.

    The Gcode isn't as consistent though, there seems to be less speed setting (G1 Fsomething) in the 150mm/s file.

     

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    Posted · Cura 14.03 Speed not changing

    Here's another example. In this less tiny case, the g-code is defferent, but the time estimate is approximately the same.

    The Codes don't correspond exactly to the speed I set, which makes me think that Cura is inherently imposing some limit.

    Printer: Ultimaker 2, minimum time per layer set to 0, all the speed modifiers are also 0 except for travel speed which is set to 150. The print speed was set to 50 and 150 respectively for this test.

    Here's a scaled down (25.4mm high) cute spocktipus at 150mm/sec. Note no speed setting on this layer. It was last set just before Layer 4 to G1 F7020, which I believe works out to 117mm/sec. On Layer 3, the speed is set on every line that extrusion takes place.


    ;LAYER:20
    G0 X118.72 Y120.94 Z2.30
    ;TYPE:WALL-INNER
    G1 X118.61 Y120.90 E747.54237
    G1 X118.56 Y120.89 E747.54455
    G1 X118.51 Y120.87 E747.54674

    In the 50mm/sec example the speed is set to 50mm/sec on the first extrusion line of the layer:


    ;LAYER:20
    G0 F9000 X118.72 Y120.94 Z2.30
    ;TYPE:WALL-INNER
    G1 F3000 X118.61 Y120.90 E747.54237
    G1 X118.56 Y120.89 E747.54455
    G1 X118.51 Y120.87 E747.54674
    G1 X118.44 Y120.86 E747.54928
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    Posted · Cura 14.03 Speed not changing

    Here's a scaled down (25.4mm high) cute spocktipus at 150mm/sec. Note no speed setting on this layer. It was last set just before Layer 4 to G1 F7020, which I believe works out to 117mm/sec.

    It's starting to sound like you found a bug maybe. But be aware that the bottom most layer speed you have set to 20mm/sec and Cura doesn't just jump immediately to the nominal speed on the next layer but goes up a little more gradually. Maybe over 3 layers?

    Also be aware that for short movements - say less than 10mm, it is unlikely that the X and Y axes even get up to full speed due to acceleration and jerk settings. So Cura's time estimate might (correctly) not change much at all even if the nominal speed is much higher.

    I assume you are in ultigcode mode, but in reprap mode, the retraction speed is specified with the F (feedrate) command and you can't have different feedrates for different axes so in reprap mode Cua has to insert the nominal feedrate after every retraction. In ultigcode mode it doesn't have to but perhaps it does anyway. That might be why on some layers you seem to get many more F commands.

    Also on every Z axis move (at the end of every layer) you might also get F commands there.

     

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