Printing w 0.25 nozzle - filament grinding/skipping  

RE: Printing w 0.25 nozzle - filament grinding/skipping

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RE: Printing w 0.25 nozzle - filament grinding/skipping

I possibly have found a way out. Maybe temporary until next failure. But i could dish out two successsful prints in a row.

So a combination of many things

a) NOULEI SILK PLA filament is "soft".

Tighten a lot the extruder... despita all what is said. The head of the screw emerges just slightly from the extruder body (on the left)

Adding the heat dissipator helped a little. https://fr.aliexpress.com/item/32960685933.html?spm=a2g0s.9042311.0.0.5dad6c37Y59Cen

as added heat even softens the PLA filament...

I will move to BNBSX extruder when all pieces will be received. Having the motor heat away seems a key enabler here. Plus i need more consistent extrusion...

B) Piece is very small with thin walls & inner corners

- retractation settings. 0.6mm retractation is ok... but minimal move of 1mm is not enough. Possibly easily grinding. I tried 0.3/1.5mm and it is better seemingly. Or perhaps 0.6mm that too much retractation for a 0.25 nozzle ending if too frequent in a move backward/grinding issue ?

- also removed the retractation at layer change

- A key issue seems to come that some parts require "too few" output of the nozzle. Even smaller than the 0.2 walls. studying the preview image with functional colors, it seems to there were too many "gaps filling".. smaller than the 0.2 width.  that was the tricky part. I tried to put "gaps filling speed" at 0 and that removed the gaps fill lines in the preview & in the print

- only walls are left at 0.2mm. infill is set at 0.25

- weird bnehaviour : gyroid infill makes my slicer crash ! And possibly impacts some the print fail0 at  22mm as i frequently endured. Going to linear is ok for this piece.

- untick "detect fine walls" : details are lost

- infill/walls overlap at 15% as i have extended the infill widtyh to .25

- forced min/max height at 0.1mm in the profile. possibly no effect. 

Just wanted to share. If someone happens to read my posts...

I have 

RE: Printing w 0.25 nozzle - filament grinding/skipping

As a point of reference, many people print with a 0.25 mm nozzle without issues.  It is a matter of making adjustments to print parameters during slicing.  

RE: Printing w 0.25 nozzle - filament grinding/skipping

Thanks for popping !

I had no issue until i started using that nice but soft PLA...

RE: Printing w 0.25 nozzle - filament grinding/skipping

I've experienced same thing with Polyalchemy Elixir and 0.25 nozzle. I even tried without any retractions and faster filament flow and it still happens pretty fast. So heat creep is not a root cause.

I don't think the extruder motor heat is a root cause for that. It's more likely that the particles which makes the filament nice and shiny tend to block the nozzle, so you get a high back pressure. Looks like a physical limitation to me. Using bigger nozzle size or different filament is a solution.

RE: Printing w 0.25 nozzle - filament grinding/skipping

Same thing happened to me. I spent months tweaking settings trying to print Silk PLA with a 0.25 mm nozzle and I never got clogs, but always got ugly waves in my prints at every layer height. Perhaps printing at ridiculously slow speeds would make a difference but that was not practical for my business.

Extrude some in the air and you'll notice the stuff expands terribly thick. I'm sure this has something to do with the problems we are both experiencing

I can print the silk PLA with 0.4 mm nozzle, but for 0.25 mm nozzle I need to use a more standard PLA like Hatchbox or Prusa PLA and unfortunately they don't have the shine of the Silk PLA. I might try using ironing on the flat surfaces for better effect with regular PLA.

The vendors on Amazon that say their Silk PLA prints like regular PLA are engaging in false advertising which unfortunately cost me months of time because I believed them...oh well, live and learn.

RE: Printing w 0.25 nozzle - filament grinding/skipping

Another thing I found with printing 0.25 mm, the purge lines in slicer are way over the top for this nozzle, your going to be forcing melted filament back up the nozzle towards the heat break and asking for trouble before you even start.

In Prusa Slicer, make sure you are using a 0.25 mm profile in your printer settings or create one, and change the default purge values in custom G-Code from 

G1 X60.0 E8.0 F1000.0 ; intro line
G1 X100.0 E12.0 F1000.0 ; intro line

to 

G1 X60.0 E5.0 F1000.0 ; intro line
G1 X100.0 E8.0 F1000.0 ; intro line

The 8 and 12 are fine for a 0.4 mm nozzle, but too much for a 0.25 mm nozzle.

RE: Printing w 0.25 nozzle - filament grinding/skipping

Thanks for the two of you for the support ! it's been a while (or so I feel) I posted this.

I updated my intro line. thankee (both cura & slic3r)

I finally do found some ways to print that Silk PLA because that's the one I want for my pieces. Been printing since 3 to 4 months now.

Still in nozzle 25 (but even with 0.2 width), NO RETRACTATION, tighten the extruder until the screw head on the left  is at the body surface level

Retractation : could not find acceptable values - surely did not try enough. Maybe can you share ?

Speed ? I'm not going that slow 50mm/s is fine. Attachment my saved working profile on cura. Check values there. 

I can't get ironing cool on large flat surfaces (always marks of moves). How do you iron on slic3r ?  Falling back to Cura for this

Let me know your thoughts - and thanks for your participation !

Cheers,

Wil

RE: Printing w 0.25 nozzle - filament grinding/skipping

Cura profile attachment rejected...

Copy/paste... 

version = 4
name = I3 NOULEI
definition = fdmprinter

[metadata]
quality_type = fast
setting_version = 10
type = quality_changes

[values]
acceleration_enabled = True
adhesion_type = raft
default_material_bed_temperature = 60
jerk_enabled = True
layer_height = 0.1
layer_height_0 = 0.1
print_sequence = one_at_a_time
remove_empty_first_layers = False
retraction_combing = all
support_enable = False
travel_retract_before_outer_wall = False

[general]
version = 4
name = I3 NOULEI
definition = fdmprinter

[metadata]
position = 0
intent_category = default
quality_type = fast
setting_version = 10
type = quality_changes

[values]
acceleration_infill = 300
acceleration_ironing = 100
acceleration_layer_0 = 300
acceleration_print = 300
acceleration_roofing = 1000
acceleration_skirt_brim = 1000
acceleration_topbottom = 300
acceleration_travel = 300
acceleration_wall = 300
acceleration_wall_0 = 300
alternate_extra_perimeter = False
bottom_layers = 5
brim_width = 4
coasting_enable = False
coasting_volume = 0.015
cool_fan_full_at_height = 1
cool_min_layer_time = 2
cool_min_speed = 30
default_material_print_temperature = 203
expand_skins_expand_distance = 0.4
fill_outline_gaps = False
fill_perimeter_gaps = nowhere
filter_out_tiny_gaps = False
infill_before_walls = False
infill_line_width = 0.2
infill_pattern = gyroid
infill_sparse_density = 20
ironing_enabled = True
ironing_line_spacing = 0.05
ironing_only_highest_layer = True
ironing_pattern = concentric
jerk_print = 8
jerk_skirt_brim = 10
jerk_travel = 10
line_width = 0.2
material_diameter = 1.75
material_final_print_temperature = 195
material_flow = 102
material_initial_print_temperature = 203
material_print_temperature = 205
material_print_temperature_layer_0 = =material_print_temperature
meshfix_maximum_resolution = 0.05
meshfix_union_all = False
optimize_wall_printing_order = True
outer_inset_first = False
raft_airgap = 0.05
raft_margin = 2
retract_at_layer_change = False
retraction_amount = 0.8
retraction_enable = False
retraction_extra_prime_amount = 0
retraction_extrusion_window = 1
retraction_hop = 0.6
retraction_hop_enabled = True
retraction_min_travel = 1.5
retraction_speed = 50
skin_preshrink = 0.4
small_feature_max_length = 0.1
speed_equalize_flow_enabled = False
speed_infill = 40
speed_ironing = 13
speed_layer_0 = 25
speed_print = 30
speed_topbottom = 20
speed_travel = 200
speed_wall_0 = 30
speed_wall_x = 30
support_bottom_density = 40
support_infill_rate = 18
support_interface_enable = False
support_interface_pattern = zigzag
support_line_width = 0.35
support_roof_density = 60
support_roof_enable = =extruderValue(support_roof_extruder_nr, 'support_interface_enable')
support_z_distance = 0.2
top_bottom_pattern = concentric
top_layers = 5
travel_compensate_overlapping_walls_enabled = True
wall_0_inset = 0
wall_0_wipe_dist = 0.13
wall_line_count = 3
wall_line_width_0 = =wall_line_width
wall_line_width_x = 0.2
wall_thickness = 0
z_seam_corner = z_seam_corner_none
z_seam_type = back
z_seam_x = -30
z_seam_y = -200
zig_zaggify_infill = True

RE: Printing w 0.25 nozzle - filament grinding/skipping

Any time you want to load any type of file to the forum - zip it up first.

The forum has a thing for compressed files.

RE: Printing w 0.25 nozzle - filament grinding/skipping

Thanks for the tip