Jump to content
Ultimaker Community of 3D Printing Experts

Settings Based Periodic Under-Extrusion

Recommended Posts

I'm struggling with some settings-based periodic under extrusion. I think it started when I upgraded to 3.6. 

Here is an album of annotated images, describing the issue; 



Some notes on the issue: 

  • Doesn't happen on brims or skirts, or bridges. Seems to happen on walls, and fill. Which leads me to believe that it's not mechanical, it's settings-based. 

  • Happens regardless of machine. These were on both my CR10s5 and Wanhao Duplicator i3 Mini.

  • Happens on different filaments (including ones I've used to great success previously)

  • Happens regardless of retractions in the area.

  • Happens relatively consistently between layers.


Anyone got any ideas as to what I might be doing wrong?




Share this post

Link to post
Share on other sites

It looks like the problem is only on the bottom layer.  The bottom layer is extremely sensitive to "leveling" or how close the nozzle is to the bed when printing the bottom layer.


It looks to me like your extruder is slipping occasionally and that is probably because you are just a little too close to the bed.  Or maybe your extruder is a bit weak.  Or the teeth in the extruder are a bit weak and the filament slips backwards occasionally.  


As a test, hold the filament while it is printing the bottom layer and feel for it moving backwards suddenly followed by these underextrusion spots on the bottom layer.  The fix might be to level about 0.05mm farther from the bed.  yes, one half of one tenth of one mm.  0.05mm.  That might be enough.

Share this post

Link to post
Share on other sites

Thanks so much for the reply! 


Unfortunately it's not only the first layer. It's all the way through. The last two images are the topmost layer. And watching it print, I can see this issue occuring on every layer right the way through, in the same places on each layer. Note the artifact appears in the layers on the closest corner in images 3&4. 


It's definitely not a leveling issue, when I live level the whole bed with a huge brim on a cube it doesn't appear. It doesn't appear on any brims, actually, no matter how wide. Or bridges. Only fill and perimeters. I know leveling can cause a similar effect, but if you zoom in on image 1 you can see it's not squishing the filament, it's simply not extruding it. This is evidenced in the little drippy line that appears instead of a smudgy one from a too-close bed. 


And yea, it happens on every layer, so not leveling I'm afraid. :( 


The extruder gears seem in good repair on both of the machines I'm working on.



Share this post

Link to post
Share on other sites
15 minutes ago, BillieRuben said:

It looks like I'm not the only one experiencing this issue since updating to Cura 3.6, here's another user on Reddit:



Yep, that'd be me. I was right next to the printer when it started doing this unusual underextrusion pattern, and I do not believe my printer is at fault for a few key reasons.

  • The filament can't slip as I bought a bondtech extruder a few months ago, which has completely erased any issues related to filament grinding and slipping for me
  • When I was observing the several layers that started with underextrusion (with some overextrusion around the rest of that perimeter) I heard no clicking from the stepper, so it wasn't missing steps or anything.
  • I only saw underextrusion like this when I upgraded to Cura 3.6.0 last night. I was using 3.5.1 before that.
  • These lines are clustered together in the exact same spot, and are too consistent for me to consider it random underextrusion.

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

    • 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.
      • 0 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!