PLA retraction settings below .1mm

[bot]

Hi everyone. I've been trying to get the finest detail possible with the stock .5mm nozzle. I've got great prints at 70 micron layers. There are two small issues with the prints remaining that I'm trying to resolve.

I'm getting bad (what I think are) retraction artifacts between the arms, but barely any stringing between the legs.

Also, I'm getting those ridges, which appear higher on the model, where the print speeds would have been greater.

Do you think both issues are related to print speed? The lines, I believe, are from fluctuating nozzle temperature (I've seen that before in other prints). Maybe it's fluctuating due to too many speed changes?

Here is my Cura profile for this print:

Code: Select all

[profile]
layer_height = 0.07
wall_thickness = .6
retraction_enable = True
solid_layer_thickness = .6
fill_density = 0
nozzle_size = 0.5
print_speed = 120
print_temperature = 195
print_temperature2 = 0
print_temperature3 = 0
print_temperature4 = 0
print_bed_temperature = 60
support = None
platform_adhesion = None
support_dual_extrusion = Both
wipe_tower = False
wipe_tower_volume = 15
ooze_shield = False
filament_diameter = 1.75
filament_diameter2 = 0
filament_diameter3 = 0
filament_diameter4 = 0
filament_flow = 100
retraction_speed = 140
retraction_amount = 5.4
retraction_dual_amount = 16.5
retraction_min_travel = 1.5
retraction_combing = True
retraction_minimal_extrusion = 0.02
retraction_hop = .075
bottom_thickness = 0.2
layer0_width_factor = 100
object_sink = 0.6
overlap_dual = 0.15
travel_speed = 200
bottom_layer_speed = 50
infill_speed = 0
inset0_speed = 0
insetx_speed = 0
cool_min_layer_time = 20
fan_enabled = True
skirt_line_count = 4
skirt_gap = 3.0
skirt_minimal_length = 300
fan_full_height = 0
fan_speed = 100
fan_speed_max = 100
cool_min_feedrate = 15
cool_head_lift = False
solid_top = True
solid_bottom = True
fill_overlap = 0
support_type = Grid
support_angle = 60
support_fill_rate = 5
support_xy_distance = 0.7
support_z_distance = 0.15
spiralize = False
simple_mode = False
brim_line_count = 4
raft_margin = 5.0
raft_line_spacing = 3.0
raft_base_thickness = 0.3
raft_base_linewidth = 1.0
raft_interface_thickness = 0.27
raft_interface_linewidth = 0.4
raft_airgap = 0.22
raft_surface_layers = 2
fix_horrible_union_all_type_a = False
fix_horrible_union_all_type_b = True
fix_horrible_use_open_bits = False
fix_horrible_extensive_stitching = False
plugin_config = 
object_center_x = -1
object_center_y = -1

[teoman]

I do not think that it is the case with your print, but if you do not have your extruder calibrated, the extra extrusion builds up and when the nozzle raises it dumps the pressurized filament.

[Eaglezsoar]

Three things I would try, slower speeds, shorter retraction length and slower retraction speeds.

[bot]

Excellent suggestions. I'll verify the extruder settings. It could be that the filament is slightly OD. The retraction length is a great suggestion. I had noticed increasing the length actually made things worse!

Thanks.