Jump to content

UM3 - Strange behaviour with a second blob being extruded before the print starts, and a nearly 4-inch filament retraction when aborting a print


Recommended Posts

Posted (edited) · UM3 - Strange behaviour with a second blob being extruded before the print starts, and a nearly 4-inch filament retraction when aborting a print

I'm running Ultimaker 4.9.1 with a UM3 and I've been using UM3 firmware version due to the autolevelling bug that was introduced in later firmware. 

For the first time since owning the printer for a couple years, I ran a print using a raft. Print setting set to Fine, with prime blob enabled. I had breakaway material as the raft in extruder 2, and PLA in extruder 1. After the raft was laid down, extruder 1 created the prime blob, lowered and smashed into the prime blob (as it always does, and also dragging the molten mess across the bed), and moved to it's starting position, whereby it then proceeded to extrude a second blob before starting to print. See the pictures, you can see the blob on the prime tower. The first time this happened, I didn't use the prime tower. My second print had the prime tower enabled in an effort to keep the blob away from the print.

The print eventually failed for other reasons, forcing me to abort the print, which resulted in the second odd behaviour I had never seen before. Upon abort, extruder 1 proceeded to retract the filament by nearly 4 inches. See pictures

Has anyone seen either of these issues before?




Edited by Duckminster
improve clarity
  • 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
        • 48 replies
    • Create New...