Jump to content

No extrusion when starting print


Recommended Posts

Posted · No extrusion when starting print

This post is with regards to my new Ultimaker 2 which I received less than a week ago.

I've already posted this morning regarding a problem but thought I should keep this separate as it is a different problem.

Every time I switch on to try to print the print begins but no material is extruded. If left then material does eventually extrude half way through the print (resulting in a useless ball of material).

What I usually do is abort the print and then heat the extruded head up to 260 and then feed some material through to get it started.

Am I doing something wrong here or is my machine faulty?

Surely I am not expected to do this every time?

I must say that with this being the second problem with my Ultimaker 2 immediately after removing it from the box I am pretty disappointed so far.

  • Link to post
    Share on other sites

    Posted · No extrusion when starting print

    Sometimes the PLA drains out if the nozzle is hot but not printing (like from the end of your last print).

    I found that making a simple change to the start.gcode (found from Cura in the Start/End-GCode tab) to make more filament extrude in the beginning, here is the new portion of code (commented old line, newline added below):

    ;G1 F200 E3 ;extrude 3mm of feed stock

    G1 E14 F300 ;14mm at 300mm/s


  • Link to post
    Share on other sites

    Posted · No extrusion when starting print

    Changing the start gcode won't help for the UM2, in its default mode as the start/end gcode is implemented on the printer itself, whereas its configurable for the UM1.

    However, as Anthony says, plastic can tend to ooze from the head if it's sat with the nozzle hot, so that when the print starts, it doesn't always extrude at first, until the nozzle has refilled with plastic.

    Have you updated to the latest firmware? (As shipped with last week's release of Cura 13.12?) There's a bug in that that causes excessive retraction at the filament after you abort a print. Could that be the problem? For now the preheat and manually advance option is the best fix, but hopefully they will have a fix for that very soon.

    Don't give up hope! These are new machines, and there are still some teething problems. But UM is working hard to fix them, and there are a lot of folks on here who can help with any issues you run into. The results from the printer can be stunning, so don't get downhearted - you picked a great printer, and it will give you some great results.


  • Link to post
    Share on other sites

    Posted · No extrusion when starting print

    260C is dangerously hot for PLA. If you let it sit long at that temp it is likely to boil and turn to gunk and clog your tip. This temp is okay when you are printing fast though e.g. 200mm/sec .1mm layers or 100mm/sec .2mm layers.

    If I'm not in a rush I print at temps between 190C and 220C.


  • 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 5.3 stable released
        In this stable release, Cura 5.3 achieves yet another huge leap forward in 3D printing thanks to material interlocking! As well as introducing an expanded recommended print settings menu and lots of print quality improvements. Not to mention, a whole bunch of new printer profiles for non-UltiMaker printers!
          • Thanks
          • Like
        • 56 replies
      • Here it is. The new UltiMaker S7
        The UltiMaker S7 is built on the success of the UltiMaker S5 and its design decisions were heavily based on feedback from customers.
        So what’s new?
        The obvious change is the S7’s height. It now includes an integrated Air Manager. This filters the exhaust air of every print and also improves build temperature stability. To further enclose the build chamber the S7 only has one magnetically latched door.
        The build stack has also been completely redesigned. A PEI-coated flexible steel build plate makes a big difference to productivity. Not only do you not need tools to pop a printed part off. But we also don’t recommend using or adhesion structures for UltiMaker materials (except PC, because...it’s PC). Along with that, 4 pins and 25 magnets make it easy to replace the flex plate perfectly – even with one hand.
        The re-engineered print head has an inductive sensor which reduces noise when probing the build plate. This effectively makes it much harder to not achieve a perfect first layer, improving overall print success. We also reversed the front fan direction (fewer plastic hairs, less maintenance), made the print core door magnets stronger, and add a sensor that helps avoid flooding.

        The UltiMaker S7 also includes quality of life improvements:
        Reliable bed tilt compensation (no more thumbscrews) 2.4 and 5 GHz Wi-Fi A 1080p camera (mounted higher for a better view) Compatibility with 280+ Marketplace materials Compatibility with S5 project files (no reslicing needed) And a whole lot more  
        Curious to see the S7 in action?
        We’re hosting a free tech demo on February 7.
        It will be live and you can ask any questions to our CTO, Miguel Calvo.
        Register here for the Webinar
          • Like
        • 18 replies
      • UltiMaker Cura Alpha 🎄 Tree Support Spotlight 🎄
        Are you a fan of tree support, but dislike the removal process and the amount of filament it uses? Then we would like to invite you to try this special release of UltiMaker Cura. Brought to you by our special community contributor @thomasrahm
        We generated a special version of Cura 5.2 called 5.3.0 Alpha + Xmas. The only changes we introduced compared to UltiMaker Cura 5.2.1 are those which are needed for the new supports. So keep in mind, this is not a sneak peek for Cura 5.3 (there are some really cool new features coming up) but a spotlight release highlighting this new version of tree supports.  
          • Like
        • 29 replies
    • Create New...