Jump to content
Ultimaker Community of 3D Printing Experts
tmcolby

Prime blob problem

Recommended Posts

My UM3 started doing this weird issue after it prime blobs extruder 1. I've been using the same settings profile, and now for some reason it leaves a long streak of material all the way across the bed. I am printing on a raft. Any ideas? 

 

After the blob, it does a very slow move to back corner extrudding the whole way.

IMG_20180913_190720.jpg

Share this post


Link to post
Share on other sites

ok, after a bunch of testing.. the problem manifests when i use "max comb distance with no retract"

 

my stock settings profile works as it used to.

if i plug in a value of 10mm into "max comb distance with no retract" the problem shows up.

 

whats up with that?  does anyone else use that feature with success.  i swore i had it working before and i really liked it because i like to print my parts on a raft of breakaway material to get a consistent surface texture.  this feature would leave the raft pristine so i dont get any strands in my surface layer of my print.

Share this post


Link to post
Share on other sites

If there is no retraction the material will continue to heat in the extruder and melt out. If the retraction is too short an amount of material will still heat up and drip out. It seems that reducing the temperature slightly  and retracting by an exact amount is necessary to keep the material of the not in use extruder from dripping all over the place. Do you think the red line could be because the material is slowly melting out of the extruder? The strange thing is that the red material seems like a somewhat even extrusion.

Share this post


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

    • Introducing Ultimaker Cura 3.6 | Beta
      Ultimaker Cura 3.6 | Beta is available. It comes with new features, bug fixes, and UX improvements. We would really like to have your feedback on it to make our stable release as good as it can be. As always, you can download the beta for free from our website, for Windows, MacOS, and Linux.
        • Like
      • 92 replies
    • Print Core CC | Red for Ruby
      Q: For some users, abrasive materials may be a new subject matter. Can you explain what it is that makes a material abrasive when you are not sure which print core to use?
      A: Materials which are hard in a solid piece (like metals, ceramics and carbon fibers) will generally also wear down the nozzle. In general one should assume...
        • Like
      • 30 replies
    • "Back To The Future" using Generative Design & Investment Casting
      Designing for light-weight parts is becoming more important, and I’m a firm believer in the need to produce lighter weight, less over-engineered parts for the future. This is for sustainability reasons because we need to be using less raw materials and, in things like transportation, it impacts the energy usage of the product during it’s service life.
        • Like
      • 12 replies
×

Important Information

Welcome to the Ultimaker Community of 3D printing experts. Visit the following links to read more about our Terms of Use or our Privacy Policy. Thank you!