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Ormerod 1 PLA blobs in corners and when nozzle stops

Posted by WolfgangA 
Ormerod 1 PLA blobs in corners and when nozzle stops
October 25, 2014 03:42PM
Dear community,

what should I do to fix this issue? I am relatively new to 3D printing and have issues getting my Ormerod 1 (firmware 0.78c) right. I am using Slic3r 1.2.0. Biggest problem at the moment are drops in corners and at all points when the nozzle stops. I have already tried a couple of tweaks with retracting, nozzle temp etc. but I don't get it.

See attached pictures, that explains best. Here is my Slicer config.

Many thanks for any help
Wolfgang

[filament:Ormerod-0.5]
bed_temperature = 60
bridge_fan_speed = 100
cooling = 1
disable_fan_first_layers = 3
extrusion_multiplier = 1.02
fan_always_on = 0
fan_below_layer_time = 60
filament_diameter = 1.75
first_layer_bed_temperature = 60
first_layer_temperature = 200
max_fan_speed = 100
min_fan_speed = 35
min_print_speed = 10
slowdown_below_layer_time = 15
temperature = 195

[print:Ormerod-0.5]
avoid_crossing_perimeters = 0
bottom_solid_layers = 2
bridge_acceleration = 0
bridge_flow_ratio = 1
bridge_speed = 45
brim_width = 0
complete_objects = 0
default_acceleration = 0
dont_support_bridges = 1
external_perimeter_extrusion_width = 0
external_perimeter_speed = 45
external_perimeters_first = 1
extra_perimeters = 1
extruder_clearance_height = 20
extruder_clearance_radius = 20
extrusion_width = 0
fill_angle = 45
fill_density = 30%
fill_pattern = honeycomb
first_layer_acceleration = 0
first_layer_extrusion_width = 0.8
first_layer_height = 0.36
first_layer_speed = 50%
gap_fill_speed = 10
gcode_comments = 0
infill_acceleration = 0
infill_every_layers = 1
infill_extruder = 1
infill_extrusion_width = 0
infill_first = 0
infill_only_where_needed = 0
infill_speed = 45
interface_shells = 0
layer_height = 0.2
min_skirt_length = 0
notes = 
only_retract_when_crossing_perimeters = 0
ooze_prevention = 0
output_filename_format = [input_filename_base].gcode
overhangs = 1
perimeter_acceleration = 0
perimeter_extruder = 1
perimeter_extrusion_width = 0
perimeter_speed = 45
perimeters = 2
post_process = 
raft_layers = 0
resolution = 0
seam_position = nearest
skirt_distance = 3
skirt_height = 1
skirts = 2
small_perimeter_speed = 32
solid_fill_pattern = rectilinear
solid_infill_below_area = 70
solid_infill_every_layers = 0
solid_infill_extrusion_width = 0
solid_infill_speed = 40
spiral_vase = 0
standby_temperature_delta = -5
support_material = 0
support_material_angle = 0
support_material_enforce_layers = 0
support_material_extruder = 1
support_material_extrusion_width = 0
support_material_interface_extruder = 1
support_material_interface_layers = 0
support_material_interface_spacing = 0
support_material_interface_speed = 100%
support_material_pattern = rectilinear
support_material_spacing = 2.5
support_material_speed = 40
support_material_threshold = 0
thin_walls = 1
threads = 2
top_infill_extrusion_width = 0
top_solid_infill_speed = 40
top_solid_layers = 3
travel_speed = 250
xy_size_compensation = -0.095

[printer:Ormerod-0.5]
bed_shape = 0x0,200x0,200x200,0x200
end_gcode = G1 X2 Y190 ; move head close to home, and bed to the left\nM104 S0\nM140 S0
extruder_offset = 0x0
gcode_flavor = reprap
layer_gcode = 
nozzle_diameter = 0.5
retract_before_travel = 2
retract_layer_change = 1
retract_length = 4
retract_length_toolchange = 10
retract_lift = 0
retract_restart_extra = 0
retract_restart_extra_toolchange = 0
retract_speed = 100
start_gcode = G28  ; home all axes\nG32  ; automatic bed compensation\nG1 X60 Z10 F5000 ; lift nozzle and move a bit towards center\nM83  ; extruder to relative mode\n
toolchange_gcode = 
use_firmware_retraction = 0
use_relative_e_distances = 1
vibration_limit = 0
wipe = 1
z_offset = 0

Edited 3 time(s). Last edit at 10/25/2014 06:34PM by WolfgangA.
Attachments:
open | download - IMGP6704small.JPG (489.3 KB)
open | download - IMGP6708small.JPG (302.3 KB)
open | download - IMGP6712small.JPG (482.6 KB)
open | download - IMGP6714small.JPG (201.3 KB)
open | download - IMGP6717small.JPG (514.5 KB)
Re: Ormerod 1 PLA blobs in corners and when nozzle stops
January 15, 2015 04:23AM
Bringing up this old post just not to open a new one.

Been having this problem again after a long time of not having problems at all.

This is the Z nut trap.


The problems on the left picture come when the nozzle visits the same place twice in a very short period of time (guessing it does not have time to cool off), and cura does not have "start layers at random points" option.
I was thinking about temperature problem (185-175C) but everything else on that piece is fine so Im not sure.
Retraction is set at 110-4mm.

Regards,
Antonio

Edited 1 time(s). Last edit at 01/15/2015 04:25AM by Sardi.
Re: Ormerod 1 PLA blobs in corners and when nozzle stops
January 15, 2015 03:54PM
Thank you for your answer, Antonio! When I have the time, I will try to add a fan, had already thought I should do that. smiling smiley
Re: Ormerod 1 PLA blobs in corners and when nozzle stops
January 16, 2015 04:13AM
In addition to a fan, try making a sacrificial column (in the same height as the model) far away from the model as possible, so that the head goes away from your original model and gives time for your part to cool down winking smiley
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