Jump to content

2-4rd Layer Underextrusion


Recommended Posts

Posted · 2-4rd Layer Underextrusion

Pretty much since I have had my UM2 I've suffered from slight under-extrusion in the layers just after the bottom layer. This is usually worst in the 3rd layer when the fans fully kick in.

I print PLA with 0.1mm layer with slightly slower speeds. 210C for nozzle and 60C for bed. Otherwise standard settings.

My parts are usually mechanical with tight restrictions on the outer diameter so I don't level the bed super close to avoid the first layer gain/squeeze. I still get nice solid and flat first layer though.

I have 0.6mm bottom/top and 0.3mm initial layer so my printer does 4 layers before starting infill. The layers 2-3 are usually the worst... the fill ends up being bit like webbing and you can see that the two ply walls are not perfect either. By the 4th and 5th layer everything is proper solid already. Looking at the final piece from side you can see this also as a little indent before the things clear up. Generally I'm happy with the overall results.

I would not be too fuzzed but the first couple layers are actually the most crucial for my designs as that's where my gear teething are supposed to mesh. I've read the Visual Ultimaker Troubleshooting Guide by 3DVerkstan

Any ideas how could I further improve my second and third layers?



  • Link to post
    Share on other sites

    Posted · 2-4rd Layer Underextrusion

    Perhaps you could try kicking the fans on more gradually if that's possible for your design. That way the head will have more time to compensate for the extra air flow. Since you say it coincides with the fans going up to full speed I'm guessing that the PID loop doesn't quite have time to react to keep the temperature stable.

    You could also try printing a little bit hotter so that there's a larger temperature margin for the plastic to stay hot enough.


  • Link to post
    Share on other sites

    Posted · 2-4rd Layer Underextrusion

    I suspect it is nozzle temp is too cold for the underextruded layers. Leave the printer in the TUNE menu while printing and monitor the temp closely when going over the problem layers. Consider increasing the nozzle temp a bit if thats the problem. There maybe some temperature isulation factor between the temp sensor or the heater and the block causing the PID controller to oscillate for the bottom/problem area.

    Consider printing at anywhere up to 240C (240C is a safe temp for PLA but don't go any higher). The warmer you go the easier the plastic flows (less viscous).


  • Link to post
    Share on other sites

    Posted · 2-4rd Layer Underextrusion

    Instead of doing the fan control from the printer's own menu can I gradually bring in the fans via the expert menu? I've seen the fan settings there but It wasn't clear if I could increase like +10% each layer or so until 100%


  • Link to post
    Share on other sites

    Create an account or sign in to comment

    You need to be a member in order to leave a comment

    Create an account

    Sign up for a new account in our community. It's easy!

    Register a new account

    Sign in

    Already have an account? Sign in here.

    Sign In Now
    • Our picks

      • S-Line Firmware 8.3.0 was released Nov. 20th on the "Latest" firmware branch.
        (Sorry, was out of office when this released)

        This update is for...
        All UltiMaker S series  
        New features
        Temperature status. During print preparation, the temperatures of the print cores and build plate will be shown on the display. This gives a better indication of the progress and remaining wait time. Save log files in paused state. It is now possible to save the printer's log files to USB if the currently active print job is paused. Previously, the Dump logs to USB option was only enabled if the printer was in idle state. Confirm print removal via Digital Factory. If the printer is connected to the Digital Factory, it is now possible to confirm the removal of a previous print job via the Digital Factory interface. This is useful in situations where the build plate is clear, but the operator forgot to select Confirm removal on the printer’s display. Visit this page for more information about this feature.
          • Like
        • 0 replies
      • Ultimaker Cura 5.6 stable released
        Cura now supports Method series printers!
        A year after the merger of Ultimaker and MakerBotQQ, we have unlocked the ability for users of our Method series printers to slice files using UltiMaker Cura. As of this release, users can find profiles for our Method and Method XL printers, as well as material profiles for ABS-R, ABS-CF, and RapidRinse. Meaning it’s now possible to use either Cura or the existing cloud-slicing software CloudPrint when printing with these printers or materials
        • 10 replies
    • Create New...