Wierdness in my first print layers

Snapmaker 2.0
1

Probably in the subsequent too but it’s most obvious at the beginning. The SN2 looks to be putting down these little blobs of filament as it prints the layers. I’m working off a brand new nozzle/hotend and did a 5x5 print level calibration before starting. I did the e-step calibration a while ago, I don’t know if that needs to be redone following print-head change. Anyway, this is what my first is looking like:

20210221_175036
20210221_1750364032×3024 543 KB

Any thoughts on what needs to be tweaked?

2

Redo the full calibration, a print head change wont be exact tolerance as the last. Do that and eliminate the possibility. Also what are your temps? Did you change filament brand/type?

1 Like
3

Whats your initial settings (1st layer speed, width, height)?
Did you clean your build sheet with isopropyl alcohol or something similar?
Did you slice your model with Luban or a other slicer?
Share your gcode to get a better insight, please.

I would suggest to print the first layer with <14mm/s@120%width, if its edgy like yours i would try a speed between 8-12mm/s.
Lower your z-offset a bit.

2 Likes
4

I’m using the same PLA that I’ve used in the past with reasonable success.
I’m using the default temps from Luban:
image

@xchrisd Usually I slice with Cura but I’ve been having issues with the latest release and gotten better results with Luban which I used for this print. If I notice any residue on the build sheet I clean it with isopropyl alchohol but I usually don’t need it.
Here are the initial settings:

image
image325×884 10.1 KB

And this is the initial gcode:

    ;Header Start
    ;FLAVOR:Marlin
    ;TIME:6666
    ;Filament used: 0m
    ;Layer height: 0.08


    ;header_type: 3dp
    ;file_total_lines: 1015968
    ;estimated_time(s): 32171.690000000002
    ;nozzle_temperature(°C): 205
    ;build_plate_temperature(°C): 70
    ;work_speed(mm/minute): 2400
    ;max_x(mm): 0
    ;max_y(mm): 0
    ;max_z(mm): 0
    ;min_x(mm): 0
    ;min_y(mm): 0
    ;min_z(mm): 0

    ;Header End

    ; G-code for 3dp engraving
    ; Generated by Snapmaker Luban 3.13.1
    ; Sun Feb 21 2021 17:39:58

    M82 ;absolute extrusion mode
    ;Start GCode begin
    M104 S205
    M140 S70
    G28 ;home
    G90 ;absolute positioning
    G1 X-10 Y-10 F3000
    G1 Z0 F1800
    M109 S205;Wait for Hotend Temperature
    M190 S70;Wait for Bed Temperature
    G92 E0
    G1 E20 F200
    G92 E0
    ;Start GCode end
    G92 E0
    G1 F3600 E-2
    ;LAYER_COUNT:361
    ;LAYER:0
    M107
    G0 F1440 X149.163 Y159.767 Z0.16
    ;TYPE:SKIRT
    G1 F3600 E0
    G1 F1080 X149.6 Y159.408 E0.01505
    G1 X150.084 Y159.116 E0.03009
    G1 X150.604 Y158.894 E0.04513
    G1 X151.15 Y158.748 E0.06017
    G1 X151.826 Y158.676 E0.07826
    G1 X158.475 Y158.538 E0.25522
    G1 X164.294 Y158.056 E0.41058
    G1 X169.67 Y157.29 E0.55507
    G1 X175.017 Y156.218 E0.70017
    G1 X177.614 Y155.581 E0.77132
    G1 X180.219 Y154.865 E0.84321