Jump to content
Ultimaker Community of 3D Printing Experts

Filament Change Leaves Blob


Recommended Posts

Posted · Filament Change Leaves Blob

I am able to use the filament change on Cura 4.8.0, but the extruder leaves a blob of material in the printed object where it stops before going to the home position. Is there a way to tell it to stop outside of the print surface. Or is the 30mm initial retract not working or is it not enough?

  • Link to post
    Share on other sites
    Posted · Filament Change Leaves Blob

    I think the retraction occurs while the nozzle is still in contact with the part.  Moving 30mm takes a bit of time so you get a deformed area.  You could try setting the Initial Retraction distance to 2 or 3 or even 0.  It would end much quicker and the print head would go to the location without spending so much time in contact with the print.

    You can also try using Pause at Height instead.  It's slightly different but I like it for filament changes because I can set the stepper disarm timeout to 1800 seconds (30 minutes) which I find to be much better than the 2 minutes that it usually is.  I don't use the initial retraction at all.  On the restart I just pull about 3mm of filament back after pushing enough by hand to change colors.  That keeps it from leaving a blob on the restart.

    • Like 1
    Link to post
    Share on other sites
    Posted · Filament Change Leaves Blob

    Thank you for the advice. I wasn't sure why it was waiting, so I will lower that and see what happens. I tried the pause at height but didn't know how to set it correctly. Any advice on that?

  • Link to post
    Share on other sites
    Posted · Filament Change Leaves Blob

    I've made several posts here about using Pause at Height.  The main thing is that you have to set it to "Layer" and not height.  If there are Z-hops in the file then Pause at Height "by Height" can be fooled because the Z keeps jumping up and down.  A layer is a layer except that in a gcode file layers start at 0 and in Cura they start at 1.  So if you look at the Cura preview and see you want to stop at layer 10, in the plugin you would put layer 9.

  • 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

      • Startups, apply for the Forward AM Innovation Award!
        Are you a startup using 3D printing? Perhaps you should continue reading... 
         
        Together with BASF we are launching the Forward AM Innovation Award - the very first global contest for startups developing new applications with 3D printing!
         
        Why apply?
        The winning startup will receive €100,000 in goods and services*, along with coaching and marketing exposure from top-notch leaders in the industry.
         

         
        Who can apply?
        Your startup creates products using Additive Manufacturing, is less than 5 years old, and has less than 50 employees. We are looking for 3D printing applications with a strong focus on innovation, sustainability and scalability.
         
        Dental aligners, shoes, tools, automotive parts, music instruments, industrial tooling and molding, medical implants, sports equipment, toys, architecture, fashion, construction... all are welcome to join!
         
        Do you have an innovative, sustainable and scalable idea that leverages the unique possibilities of 3D printing? Then it is time to apply!
        More information can be found here.
         
        Applications close on March 28th, 2021
        * What does "in goods and services" mean?
        The winner will be able to pick any item from the overall product and service portfolio of the sponsors, e.g. printers, materials, consulting, software... Choose whatever you need to accelerate your startup.
         
          • Like
        • 0 replies
      • New here? Register your Ultimaker for free 3D printer onboarding course
        Hi,
         
        Often getting started is the most difficult part of any process. A good start sets you up for success and saves you time and energy that could be spent elsewhere. That is why we have a onboarding course ready for
        Ultimaker S5 Pro Bundle, Ultimaker S5, Ultimaker S3 Ultimaker 2+ Connect.   
        They're ready for you on the Ultimaker Academy platform. All you need to do to gain access is to register your product to gain free access. 
        Ready? Register your product here in just 60 seconds.
          • Like
        • 0 replies
    ×
    ×
    • Create New...