Jump to content
Ultimaker Community of 3D Printing Experts
Sign in to follow this  

Auto tip cleaning and priming?

Recommended Posts

My prints always start a little ragged due to failure to prime the hotend and/or because the hotend has some gunk stuck to it or picks up gunk because the lack of priming underextrudes the outlines printed first.

Anyone good with GCODE? Could you spin some up to implement this:


Note I'm not talking about the out of level compensation! However, that is pretty cool and I believe already in Marlin.


Share this post

Link to post
Share on other sites

One of the 3D printers we have in our company, a HP printer, has a small wire brush located at the back of the build plate. In the software settings you can program the nozzle to be dragged through the wire brush before the start of a print and also at any time during the print.


Share this post

Link to post
Share on other sites

In the UM1 start gcode, change the line that pre-extrudes 3mm to extrude 6mm instead, and reduce the speed a bit (say F60).

Then add a G4 P2000 line after that to make it pause a moment. Then it's really easy to use needle-nosed tweezers to grab the extruded filament and move it out of the way. Finally, remember to use at least 3 passes of skirt around the print, to make sure that the filament is flowing nicely before the print proper starts.


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
Sign in to follow this  


  • Our picks

    • Architect Design Contest | Vehicles.
      We're open for entries! - Design and submit your 3D designs of architectural entourage - vehicles - for a chance to win a large filament pack. Presenting an idea, an architectural design or something as big as an urban project isn't easy. A scaled model can really help to get your idea across.
        • Like
      • 25 replies
    • What The DfAM?
      I'm Steve Cox, an experienced engineer familiar with 3D printing. I wanted to share some DfAM guidelines with this community to help and make stronger parts.
      I'm also an Autodesk Certified Instructor for Fusion 360, so many of the images in ...
        • Thanks
        • Like
      • 23 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!