Jump to content
skewcrap

Ninjaflex, underextrusion, printing very unreliable

Recommended Posts

Posted (edited) · Ninjaflex, underextrusion, printing very unreliable

Hi

 

I'm struggling printing Ninjaflex with my Ultimaker Original. I tried printing with the following settings:

Nozzle: 0.4mm (3dsolex)

Print speed: I tried 10 - 30 mm/s

Temp: I tried 230-250°C

Bed: 50 °C

Layer height: I tried 0.15 and 0.1mm

I tried with different values for flow and filament diameter, seems to have no impact at all.

 

I often have underextrusion, especially in the infill. At the moment I try printing a cylinder with D=20mm, H=20mm, so basically a really easy geometry. I print with 100% infill, but it ends being rather 40% because of underextrusion. The walls seem quite ok, but the infill is crap. I have a bondtech extruder and normally I don't have any issues with extrusion.

 

I already changed all wear parts of the print head including the nozzle and the teflon part.

 

Could it be bad material? The ninjaflex is approximately 2 years old.

Do I have to try a larger nozzle?

I don't know what else might be the issue.

 

Any help would be highly appreciated.

 

Regards

 

 

 

 

Edited by skewcrap

Share this post


Link to post
Share on other sites
Posted · Ninjaflex, underextrusion, printing very unreliable

No experience with Ninjaflex.  Assuming the printer is printing OK with more standard filaments, I would alter settings that would promote easier material flow.  Maybe a bit hotter yet, or taller layers.  Flexible materials are not really considered reliable for bowden printing, so I wouldn't get my hopes too high regarding the expected results.

Share this post


Link to post
Share on other sites
Posted · Ninjaflex, underextrusion, printing very unreliable

Ok, i will give it a try with an even higher temp and layer height 0.2mm. When I tried printing ninjaflex the first time 2 years a go, I just wanted to try. The results were pretty good, which of course increased the expectations.

 

What I just don't understand is that the walls basically don't suffer from underextrusion but primarily the infill.

 

Quote

Flexible materials are not really considered reliable for bowden printing, so I wouldn't get my hopes too high regarding the expected results.

 

So, how do you print flex material reliable?

Share this post


Link to post
Share on other sites
Posted · Ninjaflex, underextrusion, printing very unreliable

a bit of light oil on your filament helps to get it trough the Bowden as ninjaflex it quit 'sticky', not too much.

and check your infill speed settings, they are usually faster than the wall settings, make them the same, like you said the walls are ok.

and, if possible, no retraction.

Share this post


Link to post
Share on other sites
Posted · Ninjaflex, underextrusion, printing very unreliable

Retraction is off, infill speed is the same as the walls. When I try the oil, isn't it bad when I print PLA again? Maybe silicon spray would be a better option?

Share this post


Link to post
Share on other sites
Posted · Ninjaflex, underextrusion, printing very unreliable

the oil will burn when extruding, use just a very thin film on your filament. A bit on a (paper)towel or finger and and softly rub the filament before it enters the extruder.

Share this post


Link to post
Share on other sites
Posted · Ninjaflex, underextrusion, printing very unreliable

You might be experiencing a difference in the infill due to the slicer.  As I recall, a few slicer versions ago, infill behavior changed to be more sparse.  I don't remember if was grid or line infill that began to act differently causing much more sparse behavior.  Possibly try a different infill style depending on what you are currently using.

Share this post


Link to post
Share on other sites
Posted · Ninjaflex, underextrusion, printing very unreliable

Lubicration of the filament did the trick! :) Thanks for this hint. It's printing just fine now!

  • Like 1

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.


  • 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.
      • 98 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!