Jump to content
Sign in to follow this  
Nicolinux

Underextrusion and seam with spiralize

Recommended Posts

Posted · Underextrusion and seam with spiralize

Hi,

I have two problems with the following print:

Slow underextrusion

Although it was printed at normal speed, the extruder started skipping and underextrusion occured. Initially I lowered the temperature in order to prevent the forming of blobs (which from my understanding would form from either too much pressure or high viscosity at high temperatures).

Key print settings are:

 

  • layer height: 0.2
  • shell: 0.8
  • bottom/top: 1.2
  • speed: 50
  • temperature: 230 (later on 225)
  • spiralize: on

The model is still full of small blobs. And while I am asking for 4mm^3/s filament, it still started underextruding at 225°. I don't want to raise the underextrusion red flag and blame the extruder - just wondering why this would happen under those circumstances.

The second issue (albeit not that important) is the visible seam on the model. I thought spiralize would get rid of it. What might be the reason for the seam then?

 

Share this post


Link to post
Share on other sites
Posted · Underextrusion and seam with spiralize

Actually it is trying to do 8mm^3. I'm impressed it did so well.

The problem is with spiralize: it does it in a single pass so it is trying to do 200% flow to get that shell of 0.8. It's tough to squeeze .8mm wall out of a .4mm nozzle so it just can't quite do it. I think if you do .5 or .6mm shell you will be good.

 

Share this post


Link to post
Share on other sites
Posted · Underextrusion and seam with spiralize

No wait, according to the help tooltip for spiralize it does a single wall so it ignores the shell setting. And the print really does look like it is a single wall - it is very thin.

 

Share this post


Link to post
Share on other sites
Posted · Underextrusion and seam with spiralize

Ok, I understand now what you say. Then I could simply either reduce flow to 50% or re-slice and chose a 4mm shell.

thx.

 

Share this post


Link to post
Share on other sites
Posted · Underextrusion and seam with spiralize

But it does 2X extrusion. In cura look at meters of filament used. Then change shell to .4 and you will see it will reduce by quite a bit (the part for the wall - the base will use the same amount).

 

Share this post


Link to post
Share on other sites
Posted · Underextrusion and seam with spiralize

hen I could simply either reduce flow to 50% o

 

Yes, but not until it gets to the wall.

 

Share this post


Link to post
Share on other sites
Posted · Underextrusion and seam with spiralize

I recommend at least .5mm shell by the way. If you want this to be watertight.

 

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Our picks

    • Ultimaker Cura 4.0 | Stable available!
      Ultimaker Cura 4.0 is mainly focused on the improved user interface and cloud integration.
      As always, we want to collect your user feedback for this release. If there are any improvements you can think of, feel free to mention it here and help us to shape the next release.
      • 86 replies
×
×
  • Create New...

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!