LOTS OF BUR ON PRINTS

Hello All,

I have tried printing the calibration files and the results were excellent, while went ahead for printing a model, and seems lots of BUR on the printed result.

Slicr latest version with Infill 0.4 and the speed at 60mm/s

Also it looks that when the printer hotend travels the other end or change positions, there is trail of plastic, which is causing the BUR. Attached image for better understanding.

Any suggestions to improve the printing quality.



Thanks in advance.

Regards

Pingnagan P

Edited 1 time(s). Last edit at 03/11/2014 03:36AM by pingnagan.

Increase retraction speed and/or length. Do you use a bowden system?

I use Gantry system, and I believe the retraction speed increment is not helping, Im not sure whether I need a extruder calibration for better flow control.

Quote
pingnagan
Im not sure whether I need a extruder calibration for better flow control.

If you haven't calibrated your extruder previously, then this definitely needs to be done. In the image it looks as if you are way over-extruding.

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Here is the config file that I used, and could achieve best results, If some would like to use.

external_perimeter_speed = 50
external_perimeters_first = 0
extra_perimeters =
extruder_clearance_height = 20
extruder_clearance_radius = 20
extruder_offset = 0x0
extrusion_axis = E
extrusion_multiplier = 0.7
extrusion_width = 0
fan_always_on = 0
fan_below_layer_time = 60
filament_diameter = 1.75
fill_angle = 45
fill_density = 0.6
fill_pattern = rectilinear
first_layer_bed_temperature = 0
first_layer_extrusion_width = 200
first_layer_height = 0.2
first_layer_speed = 50
first_layer_temperature = 185
g0 = 0
gap_fill_speed = 50
gcode_arcs = 0
gcode_comments = 0
gcode_flavor = reprap
infill_acceleration = 0
infill_every_layers = 1
infill_extruder = 1
infill_extrusion_width = 0
infill_first = 0
infill_only_where_needed = 0
infill_speed = 50
layer_gcode =
layer_height = 0.2
max_fan_speed = 100
min_fan_speed = 35
min_print_speed = 10
min_skirt_length = 0
notes =
nozzle_diameter = 0.4
only_retract_when_crossing_perimeters =
output_filename_format = [input_filename_base].gcode
perimeter_acceleration = 0
perimeter_extruder = 1
perimeter_extrusion_width = 0
perimeter_speed = 60
perimeters = 3
post_process =
print_center = 100,100
raft_layers = 0
randomize_start = 0
resolution = 0
retract_before_travel = 2
retract_layer_change = 1
retract_length = 1
retract_length_toolchange = 10
retract_lift = 0
retract_restart_extra = 0
retract_restart_extra_toolchange = 0
retract_speed = 30
rotate = 0
scale = 1
skirt_distance = 0
skirt_height = 0
skirts = 0
slowdown_below_layer_time = 30
small_perimeter_speed = 50
solid_fill_pattern = rectilinear
solid_infill_below_area = 70
solid_infill_every_layers = 0
solid_infill_extrusion_width = 0
solid_infill_speed = 50
start_gcode = G28 ; home all axes\nG1 Z5 F5000 ; lift nozzle
support_material = 1
support_material_angle = 0
support_material_enforce_layers = 0
support_material_extruder = 1
support_material_extrusion_width = 0
support_material_interface_layers = 0
support_material_interface_spacing = 0
support_material_pattern = rectilinear
support_material_spacing = 0.5
support_material_speed = 50
support_material_threshold = 0
temperature = 185
threads = 2

I had an issue like that, caused by my extruder being partially clogged. The back pressure would build up, and the hotend would just ooze all over the print. The other peice of this was very weak parts.

Things came in right when I could adjust the right Extrusion multiplier and as stated above, Happy printing now.

Thanks all for updates and suggestions