Jump to content
Ultimaker Community of 3D Printing Experts

top layers not printing / joining


Recommended Posts

Posted (edited) · top layers not printing / joining

Hello, Im new to 3d printing and am hoping people can offer some advice on how to improve. Im printing jewellery using a copper PLA blend filament on the ultimaker 2. I have also used a Brass PLA filament. The result is ok, but the top layers are not complete in parts, and the infill does not meet the walls so you send up seeing gaps.

Any suggestions to improve greatly appreciated!


Heres a picture and my settings are below:



Rhino3d export settings:

Tolerance: 0.001

Max distance, edge to surface: 0.001

Min initial Quads: 16

Everything else:0


Cura settings:

Nozzle dia:0.4

Layer height:0.2

Initial layer height:0.4

Line width: 0.4

Wall Thickness:0.8

wall line count:2

Top layer thickness:0.2

Top layers:4

Bottom layer thickness: 0.8

Top bottom pattern: lines

Ignore small Z gaps

Infill density:50%

Infill wipe distance: 0.1

Infill layer thickness:0.1

Infill before walls

speed 30mm/s

outer wall speed 15mm/s

inner wall speed 30mm/s

top/bottom speed 15

Travel speed 150

cooling fans on, min layer time 5sec

union overlapping volumes

material brass PLA at 210 degrees

Also tried copper PLA at 210 degrees


Edited by Guest
  • Link to post
    Share on other sites

    Posted · top layers not printing / joining

    you can try to set the flow a bit higher like 105%-110%

    or set the line width to 0.35

    change one setting at a time to see if there is a difference, don't change everything at the same time. It is harder to evaluate what makes the difference..

  • Link to post
    Share on other sites

    Posted · top layers not printing / joining

    I would cut this part small and just print wing tips with a few hexagons as a test piece and do lots of tests.

    Brassfill is difficult to print - it has so much brass in it that it doesn't stick to itself as well as typical PLA.

    First thing I would change is to get all your speeds the same. Having an outer wall speed different than inner is asking for trouble. They will have different pressure in the nozzle and it takes a few second to switch to the new pressure causing over and underextrusion and those gaps in your top layer.

    higher flow sounds great. Keeping printing speed under 30mm/sec will help. And keep travel speed fast like 250mm/sec. Having more top layers will help also. You might not need much fan since you don't seem to have any overhangs or bridging. Not sure. Fans can also help top layer bridging over infill. So I suppose make sure fan is at 100% by the time you get to the lowest hexagon top - meaning whichever top of a hexagon is lowest - you want fan at 100% by the time the nozzle gets to that Z height.

  • Link to post
    Share on other sites

    Posted · top layers not printing / joining

    I second gr5's suggestion for a larger nozzle, as well. I use a .6 for brassfill, woodfill, and lots of other exotics. It seems the quicker you can get them out the nozzle, the better luck you have. The thicker layers bridge better a lot of times, as well.

    What retraction setting are you running? I like to retract hard and fast, but sometimes have to back it down when I'm printing exotics, I would think 4.0-4.5mm at 40mm/s.

  • 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

      • Ultimaker showcase | April 2022 | 4pm CEST | 10am EDT
        I'm excited because I've personally produced this showcase event, so if you are curious what else I'm up to nowadays, come check it out and say hi in the chat! It would mean a lot! 
          • Thanks
          • Like
        • 4 replies
      • New here? Get ahead with a free onboarding course
        Often getting started is the most difficult part of any process. A good start sets you up for success and saves you time and energy that could be spent elsewhere. That is why we have a onboarding course ready for
        Ultimaker S5 Pro Bundle, Ultimaker S5, Ultimaker S3 Ultimaker 2+ Connect.   
        They're ready for you on the Ultimaker Academy platform. All you need to do to gain access is to register your product to gain free access. 
        Ready? Register your product here in just 60 seconds.
          • Like
        • 12 replies
    • Create New...