Jump to content
Ultimaker Community of 3D Printing Experts
chenci

Help with printing

Recommended Posts

Hi, i'm having some issues with a 3d printing. It happens especially in flat surfaces like this box i printed.orange_box.thumb.jpg.44b6343aaf58aceab78c662f009bae98.jpg

You can see there are a lot of uneven surfaces and gaps between the lines. I'm not sure if it is underextruding. The first two layers are perfect. The problem happens in the last layers.

Also i have calibrated the steps/mm and i use PLA at 205° - 0.4 Nozzle

This are my settings:

orange_box_settings.thumb.PNG.b056ab9015d3ce5bf8a5bf0cb0e2f436.PNG

I use 60mm/s print speed but strangely, it prints at 30mm/s average.

Thanks for any help.

orange_box.thumb.jpg.44b6343aaf58aceab78c662f009bae98.jpg

orange_box_settings.thumb.PNG.b056ab9015d3ce5bf8a5bf0cb0e2f436.PNG

Share this post


Link to post
Share on other sites

Did you measure your filament diameter? Could there be a significant difference.

It is difficult to judge from the photo what the effect is. For under extrusion usually you see small gaps between the lines but to me it more looks like over extrusion because I can't see the small gaps but I think I see blobs of excess material.

Share this post


Link to post
Share on other sites

Yes i measured the filament diameter, it's 2.85 to 2.9. I've uploaded new photos. There are blobs but very small. Mainly i get an rough surface that feels like touching a fine sand paper.

I still have my doubts, is it under-extrusion? or over-extrusion?

I use Flow100% Retraction 6.5mm at default speed. Firmware Tinkergnome 17.02.1box3.thumb.jpg.709d3664ddbc568c5eaf3f5d8fafce28.jpg

box3.thumb.jpg.36119cd4a3aa2590fbbdb4530732f245.jpg

box3.thumb.jpg.709d3664ddbc568c5eaf3f5d8fafce28.jpg

box3.thumb.jpg.36119cd4a3aa2590fbbdb4530732f245.jpg

Edited by Guest

Share this post


Link to post
Share on other sites

My 2cents. Your first layer is too close to the bed and the layer on top keep doing full layers, making the tidalwave pattern raise to the top. Does your first layer look perfect or with small 'waves'?

Share this post


Link to post
Share on other sites

My 2cents. Your first layer is too close to the bed and the layer on top keep doing full layers, making the tidalwave pattern raise to the top. Does your first layer look perfect or with small 'waves'?

 

Hi, thanks for the reply. As i said in the first post, the first two - three layers are perfect, doesn't have any artifact or small waves. The problem happens in the last layers. I will level the bed and try again.

Share this post


Link to post
Share on other sites

At first I was also confused, since some parts in the original photo seemed okay, some seemed gaps and underextrusion, and some seemed blobs and overextrusion. But when seeing the new photos, and when seeing the original in Photoshop with only the blue color channel (blue is opposite of orange, and shows more contrast), then it is clear that there are lots of gaps. So I guess it is underextrusion. If one layer is underextruded, then of course the next layer will sink into the gaps left by the previous layer, causing an irregular surface.

Could it be that printing PLA at 0.2mm layer height and 60mm/s is a bit too fast or too cold for this combination, so the filament has not enough time to melt? This maybe in combination with tightly wound filament near the end of the spool, or with a worn-out teflon coupler?

What happens if you print it at 215°C or 220°C?

  • 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

  • Our picks

    • Taking Advantage of DfAM
      This is a statement that’s often made about AM/3DP. I'll focus on the way DfAM can take advantage of some of the unique capabilities that AM and 3DP have to offer. I personally think that the use of AM/3DP for light-weighting is one of it’s most exciting possibilities and one that could play a key part in the sustainability of design and manufacturing in the future.
        • Like
      • 3 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!