Jump to content
Ultimaker Community of 3D Printing Experts

Set Fan on result in "under extrusion" (U2+)

Recommended Posts

Hi Community,


I got the problem if fan is set on it result in under extruision. never had this issue befor but for 3 weeks i had it each time. So i stop using the fan.


It looks like the filament is not heating up enough if fan is set on. But the temp sensor (or Ulti's display) says a constant temperature. Cause that i am confused.


First option in my mind is to replace the heating bullet. But i don't want wasting money and time to replace a working heater.


Maybe someone is familiar with that issue.

I would be happy about helpfull infos.


Best regards


Share this post

Link to post
Share on other sites

Hi, i thought it was enought put printers type in the topic. I‘m sorry!


ultimaker 2+

Filament: pet (innofill), petg (two different brands)

I think it is not depending on filament because i print this filaments without this issue in former times.

At least one role was new shopped.


I forgot to tell, that increasing speed shows the same result...


and if i set the fan on, i cannot compansate the missing extrusion by increasing the extrusion multiplier...

i tried values more than 140% multiplier and temps over 10 degree over the  specs.. it didn’t  help.


the printig speed i can use is very less 60mm/s.


but please keep in mind:

the tempsensor vealue shows good match with low variations. Temp “seems” to be fine...

Share this post

Link to post
Share on other sites
1 hour ago, peterfrosta said:

i thought it was enought put printers type in the topic. I‘m sorry!

I missed that...sorry. I read the topic on the short title on the main page and jumped into the thread itself....ever just have one of those days?


However, the additional information does help.


It stands to follow that if you are having an underextrusion, increasing speed should make it worse. Did that happen?


Also, it may be possible that the temp sensor is a tad out of whack.

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

    • Ultimaker Cura | a new interface
      We're not only trying to always make Ultimaker Cura better with the usual new features and improvements we build, but we're also trying to make it more pleasant to operate. The interface was the focus for the upcoming release, from which we would already like to present you the first glance. 
        • Like
      • 130 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!