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

Printing speed for ABS, underextrusion and nozzle clogging

Recommended Posts


I have recently moved onto ABS from PLA. I was not sure how fast I could print so I did the "Can your UM2 printer achieve 10mm3/s" with ABS. No issues reaching 10mm^3/s at 260 degrees C, ABS seems to flow much better than PLA.

So I tried printing an object at 7mm^3/s and the printer run for about an hour before it suddenly stopped extruding. Before I knew what was happening the nozzle was blocked and the filament was ground on the feeder.

After declogging the nozzle I tried printing something else, again at 7mm^3/s. It printed for <20min when I noticed that it started severely underextruding. No clicking from the feeder but hardly anything was coming out of the nozzle. I lowered the printing speed to 80% and things went back to normal.

After that I printed several objects at 5mm^3/s without issues.

I should note that all objects were quite simple with hardly any retractions.

So, why do I get underextrusion/clogging after while when printing faster?


Share this post

Link to post
Share on other sites

Not sure what condition your ultimaker is in, but the nozzle is clearly still jammed, i print from 35mm to 70mm with no real issues.

Just get some white pla or something and do the atomic pull method btu make sure you do it in a corner so not to bend the bar as i did once, but managed to bend it back. thank god.

Use white, as when you have bits of tiny dirt still stuck in the nozzle they are much easiler to see than with any other material. i thought i unblocked my nozzle for ages until i used white.

The main thing for nozzle jams is temp. sometimes i print slightly hotter to get the material to pass through, also if im printing in 0.2 (to get better flow).but again, if you have to do this your nozzle is still jammed.

Unblock it and youll be fine. 50mm speed is fine for 0.1 thickness of abs or pla at their default temps unless you are using some kind od exotic materials.


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

    • How to 3D print with reinforced engineering materials
      Ultimaker is hosting a webinar where we explain how you can achieve and maintain a high print success rate using these new reinforced engineering materials. Learn from Ultimaker's Product Manager of Materials and top chemical engineer Bart van As how you can take your 3D printing to that next level.
      • 2 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!