Print quality

  • I am new to 3d printing having completed about 10 prints (half of which successfully) 🤣 I understand the software, print speed vs quality, etc. I'm learning on support placement but my question is regarding print quality.

    You only need to print one of the included models like the cat to see the kind of detail and precision the printer is capable of. What confuses me is when I download an object from thingverse and print I get no where near the finish I'm expecting. It usually looks like a grid pattern on both top and bottom. I've printed very basic objects with the highest quality settings and the result is similar.

    Does the project come with a "bad finish" already? I mean am I reproducing the terrible finish exactly as it should be? Or is the object just a smooth design by default and print settings determine the quality? I notice the gcode file for thinks like the dog or pig have way more specifications at the beginning of the file.

    Thanks for any help.

  • @Riggs It looks like an underextrusion. Try to check in Cura for "line width" setting. It should be nearly the same as the width of the nozzle you are using. Considering that the default cat printed well, I suppose you are using the default 0.4mm nozzle that came with the printer.

  • An example of what looks like a very simple print that turns out rough with 3 attempts is looks like this:

    ; FLAVOR : Marlin
    ; TIME: 2389
    ; Filament used: 3.25584m
    ; Layer height: 0.16
    MAXX: 147.184
    ; MAXY: 195.214
    ; MAXZ:4.64
    ;Generated with Cura Steam Engine 4.8.0
    M140 S60
    M190 S60
    M104 S215
    M109 S215
    M82 ; absolute extrusion mode ; Ender 3 Custom Start G-code
    G92 E0 ; Reset Extruder
    G28 ; Home all axes
    G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed
    G1 X0.1 Y20 Z0.3 F5000.0; Move to start position
    G1 X0.1 Y200.0 Z0.3 F1500.0 E15 ; Draw the first line
    G1 X0.4 Y200.0 z.3 F5000.0; Move to side a little
    G1 X0.4 Y20 z0.3 F1500.0 E30 ; Draw the second line
    G92 E0 ; Reset Extruder G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed
    G1 X5 Y20 z0.3 F5000.0; Move over to prevent blob squish

    Comes out looking like:
    alt text

    Using the pla+ filament but quality from one print to the next is very different.

  • @Riggs Hi, the print settings are essential for a high quality finish. Nozzle temperature, flow calibration, cooling, layer thickness, etc. have to be matched with the properties of the material, with the characteristics of the machine and with the shape of the model.
    Which material are you using, the same PLA sample that came with the printer?
    Regarding the gcode at the beginning of the models on the sd-card, those before G28 (auto homing) are initialization parameters that are mainly dependant on the printer make and model.
    This should be the header of the cat gcode file, what do you have instead in the gcode you sliced?

    ;Filament used: 7.81724m
    ;Layer height: 0.2
    ;Generated with Cura_SteamEngine master
    M140 S60
    M190 S60
    M104 S200
    M109 S200
    M82 ;absolute extrusion mode
    M201 X500.00 Y500.00 Z100.00 E5000.00 ;Setup machine max acceleration
    M203 X500.00 Y500.00 Z10.00 E50.00 ;Setup machine max feedrate
    M204 P500.00 R1000.00 T500.00 ;Setup Print/Retract/Travel acceleration
    M205 X8.00 Y8.00 Z0.40 E5.00 ;Setup Jerk
    M220 S100 ;Reset Feedrate
    M221 S100 ;Reset Flowrate

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