Jump to content

print head slows down for detail


Recommended Posts

Posted · print head slows down for detail


I've been having problems printing smaller details - when the print gets to the detailed sections, the printhead speed slows down a lot. This leads to too much PLA being extruded, and the surrounding plastic melts, leading to a bit of a melted mess (but fairly localised). I've tried slowing down (and speeding up) the print head speed, but this has failed to noticably change the printhead speed. I've also tried reducing the extruder feedrate, again without any impact on the problem. I've tried to attach an image showing the gear cube I have printed, showing the problem - which only occurs on the corners of the gear cube for some reason (the rest of each part prints fine).

I've been using replicatorG, with a layer thickness of 0.15mm, temp 220, 230 also.

Really not sure of the cause - it's like the whole build goes fine, then I get to the area with the small cross section, and the printer just slows down massively, maybe a movement of 1mm per second, for a movement along one side of the cross section. Then once the slow section has been done, it will speed up again - but the extrusion is then sitting on a melted blob of plastic, and the fresh extrusion melts a bit more and kind of sinks into the mess.

Anyway, any help or suggestions would be much appreciated.

many thanks

  • Link to post
    Share on other sites

    Posted · print head slows down for detail

    Most likely the result of the "cool" settings. What happens is that because the layers are smaller, the printing speed is reduced to make sure the previous layer is cooled down. However, because of this is can go so slow that you get the melted problems. Reducing the temperature also helps.

    Cura 1.0 will have a setting to ensure a minimal extrusion speed, which solves this issue. (but isn't released yet)

  • Link to post
    Share on other sites

    Posted · print head slows down for detail

    I have tried reducing the extruder temperature, and this helped a little, but did not resolve the problem. To be clear, the problem was that the print head would slow down dramatically, to maybe 1mm per second, for travel along one side of the triangle. This would result in too much plastic being extruded, and also localised melting of previously extruded material.

    I then got round to installing netfabb on my machine, and started testing it - and so far it does not seem to have the same problem. I've tried using the standard ultimaker profile, and also the same profile but with the temperature range increased by 10C which gave me better results. (Note I'm using netfabb to generate gcode then sending that to replicatorG to do the actual print, and i'm using a linux machine with Wine, if that makes any difference).

    As a result I'm not sure of the source of the problem - temperature obviously plays a role, but is not the main factor. I think it must be something with the way replicatorG generates the Gcode.

  • 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

      • UltiMaker Cura 5.7 stable released
        Cura 5.7 is here and it brings a handy new workflow improvement when using Thingiverse and Cura together, as well as additional capabilities for Method series printers, and a powerful way of sharing print settings using new printer-agnostic project files! Read on to find out about all of these improvements and more. 
          • Like
        • 7 replies
      • 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
    • Create New...