Jump to content
Ultimaker Community of 3D Printing Experts
comyz

Bottom layer issues on intricate parts only

Recommended Posts

I'm trying to print a small hex lens but the bottom layer is an absolute mess. I've sat and watched the first layer extrude and it seems to just be how the output from Cura is telling the printer to print. Other items that a more simple but similar size or larger items don't have issues with the bottom layer. 

 

I've tried playing with different types of build plate adhesions in the advanced settings - currently set to none on the last print. I've played with different values for the initial layer height which has made no difference to the outcome at all. Any ideas? Pictures attached

IMG_20180521_144113.jpg

IMG_20180521_144126.jpg

Share this post


Link to post
Share on other sites

I've seen this hundreds of times.  On my own prints as well.  Your nozzle is too far from the glass.  So the first layer is barely sticking at all.  So as it prints those circles on the bottom layer sometimes they become triangles or other shapes.  What kind of printer is this?  If this is an Ultimaker then just turn the 3 bottom screws a half turn CCW to move the glass up a bit.

Share this post


Link to post
Share on other sites

examples of how bottom layer should look.  These pictures are from the internet mostly and I am just guessing that the bottom layer height for all of these is 0.3mm (cura defaults to 0.3 or 0.27 depending).  The numbers below indicate my best guess as to how far the nozzle was from the bed (again assuming .3mm is nominal).  

 

The blue one is about perfect if you want it to stick really well.  the yellow one is a bit too squished but at least the part WILL NEVER COME LOOSE!  lol.  The black one is similar to what you are printing but even worse than what you did.  The red one is okay for small prints but for large prints they may come loose.  I aim for red or blue depending on my goals.  If I want it to stick better I squish a little more.  If I don't want the bottom layer to have a tiny brim I usually just set initial horizontal expansion to -0.2 or so but sometimes I instead go with what you see in red below.

 

skirt.png

Share this post


Link to post
Share on other sites

All I can say is your bottom layer was severely underextruded but the layers above are fine.  That is always a leveling issue.

 

Does cr10 have auto leveling?  If so a bit of filament on the tip of the nozzle can mess that up.  I am not a fan of auto leveling.

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

Announcements

  • Our picks

    • Architect Design Contest | Vehicles.
      We're open for entries! - Design and submit your 3D designs of architectural entourage - vehicles - for a chance to win a large filament pack. Presenting an idea, an architectural design or something as big as an urban project isn't easy. A scaled model can really help to get your idea across.
        • Like
      • 24 replies
    • What The DfAM?
      I'm Steve Cox, an experienced engineer familiar with 3D printing. I wanted to share some DfAM guidelines with this community to help and make stronger parts.
      I'm also an Autodesk Certified Instructor for Fusion 360, so many of the images in ...
        • Thanks
        • Like
      • 22 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!