Jump to content
sophocha

Underextrusion on outer wall

Recommended Posts

Posted · Underextrusion on outer wall

Hi all,

I always had underextrusion problems on my ender 3 since day one (specifically on long runs).Tried to fix it by slowing the speed down and it did work for the majority of my prints.I have recently switched to cura 4.2.1 and it seems that the problem is more severe now on cylindrical models.Look at the pic.Same profile, cura 3.6 on the right, cura 4.2.1 on the left. When the nozzle switch from infill to outer wall (even with retraction off!!) it still underextrudes! Tried some prime setttings but it seems nothing works. The rest of the print is spot on except the dreadful start of each outer layer.

IMG_20190806_135110.jpg

Share this post


Link to post
Share on other sites
Posted · Underextrusion on outer wall

I have heard that the Ender 3 has some problems with the feeder gear tension. There are some mods to make it stronger and more reliable. If the filament slips through the gear on your feeder, that could be a reason for under extrusion.

 

Check out the Ender forums or search on Thingiverse for modifications.

Share this post


Link to post
Share on other sites
Posted · Underextrusion on outer wall
2 minutes ago, Smithy said:

I have heard that the Ender 3 has some problems with the feeder gear tension. There are some mods to make it stronger and more reliable. If the filament slips through the gear on your feeder, that could be a reason for under extrusion.

 

Check out the Ender forums or search on Thingiverse for modifications.

I have changed the feeder gear into a metallic one.No more grinding the filament.I think the problem lies elsewhere. Everything is perfect except the very beginning of a layer.Maybe I will change the speed to a very low setting so that I can pinpoint where the problem is and go from there.

Share this post


Link to post
Share on other sites
Posted (edited) · Underextrusion on outer wall

well well, look at that....perfect outer layer.

 

1) Stick with Cura 4.2.1. Much better improved profiles.

2) No more old customized profiles.I just ditched everything....Choose the draft profile from the settings.

3) In my case, raise the temp up a little bit (210).

4) Z seam alignment (shortest) with "hide seam"

5) See the photo. Almost perfect outer wall. I knew it wasn't my printers' fault.I can go really fast as well. Do not know what the problem was. Maybe I over-tweaked some settings... 

IMG_20190806_171938.jpg

Edited by sophocha

Share this post


Link to post
Share on other sites
Posted · Underextrusion on outer wall
1 hour ago, sophocha said:

Maybe I over-tweaked some settings... 

 

Yes, that can happen faster than you think.

But good to hear that it is working now for you.

Share this post


Link to post
Share on other sites
Posted · Underextrusion on outer wall

Having this exact issue as well in 4.2.1 with minimally tweaked default profiles for CR-10. Any insights into which setting might be the culprit? I've played around with a few that I thought might have had an effect, but no dice.

Share this post


Link to post
Share on other sites
Posted · Underextrusion on outer wall

Do you still have the old profile? I really want to compare it to the default, because I too have/had that problem.

Share this post


Link to post
Share on other sites
Posted (edited) · Underextrusion on outer wall

Here is my new Cura profile on 4.3 (0.6 nozzle and PETG)

 

I think something is terribly wrong with the outer wall settings of Cura. I was always ending up with uneven walls, over-extrusion on the edges, under extrusion at the beginning of a layer, LOTS of stringing on PETG, etc. 

 

Here is a  Calibration Cube  print.

 

The one on the left is my perfect print after I tweaked my settings. Things I have done: 

 

1) Decrease my flow to 96% (Except the initial flow 98%).That helped a lot on the definition of the prints.Much cleaner prints now.  

2) Make the out wall count to at least 3. That eliminated infill showing on the outer walls.

3) THE MOST IMPORTANT SETTING.....Z seam alignment  to SHORTEST and seam corner to "hide seam". This is crucial. Any other combination of settings produced uneven outer walls, blobs and lines on the outer walls (see the obvious line in the middle of the calibration cube...middle cube in the photo).The start of each of the outer layers is slightly off with any other settings, so this produced a smooth,even outer layer. 

4) Printing temperature @ 210 no matter what everybody is saying!!  (printing at 230-240)  produces a lot of stringing on PETG. Printing at 210 made all of my prints perfect! I also have a Petsfang mod with a big fan, but I have all my fan speeds at 50%. Also, "filter out tiny gaps" (enabled). If you don't have this ON it also produces a lot of stringing cause it tries to fill the gaps and the extra filament sticks to the nozzle. 

5) Obviously enable retraction( in my case 6mm, 50mm/s speed). 

6) Printing speed around 30 to 40mm/s except the 1st layer.Also, buy a creality glass bed and some hair spray. No more problems with elephant foot or not sticking to the surface. This solved all of my issues with big prints coming off the plate. Now I have to wait for them to cool down in order to take them off the bed!

7) Enable jerk control and change the outer wall jerk to 5 mm/s.That also solved the over-extrusion/bulgy edges. Much more smooth edges!

😎 Enable coasting. I wasn't having any luck in the past with this, BUT with all these settings in mind, enabling this (default settings) will help alleviating any seam showing too much on the outer wall.....and last....

9) Outer wall wipe distance....make this 0.4mm to 0.6mm. This creates great starting layers because it wipes the nozzle. 

 

There! You now have the perfect profile for PETG.   

2020 PETG 0.6 coasting less flow.curaprofile

Edited by sophocha

Share this post


Link to post
Share on other sites
Posted (edited) · Underextrusion on outer wall

More testing on this profile. It looks really good for a PETG print on a 0.6 nozzle.

 

IMG_20200103_184608.thumb.jpg.37b94b8de0a1c45625183120b052f28f.jpg

Edited by sophocha

Share this post


Link to post
Share on other sites
Posted (edited) · Underextrusion on outer wall

....also, if you want to avoid stringing on PETG, do this mod. Take a dab of silicone, and cover your nozzle with it. Raise your temps @ 100 to cure it. Take it off and cut the very tip with a razor, just barely seeing your nozzle tip. Voila. Now the extra filament won't stick to your nozzle and make a stringing mess.

 

IMG_20200104_162809.thumb.jpg.5cd94e62fd5ed26c6a5ee3f05b255281.jpg

Edited by sophocha
  • Like 1

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

×
×
  • 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!