Jump to content
Ultimaker Community of 3D Printing Experts

Top layer fill issues

Recommended Posts

Hi all

Having trouble getting my top layers to fill in properly, plus they're not a very smooth finish. If anyone could give me any guidance at all, it would be much appreciated. I feel like I could spend a life time tweaking parameters without ever getting anywhere.

Attached images show three test cubes. The only real difference between the three, is that they have progressively more layers on the top and bottom. Just adding more layers isn't really giving me the finish I'm looking for though. You can see the sides have a nice finish on them, but the top and bottom are looking a bit rough to say the least.

Using Cura and printing on a Wanhao i3 Plus using PLA. If you need more details, please just ask. 



Share this post

Link to post
Share on other sites

It's hard to tell looking only at the top of the parts in the first picture - the problem looks like underextrusion but this could possibly be not enough top layers or infill insufficiently dense.  But I'm pretty sure it's underextrusion.


Looking at the second picture of 3 cubes - that's severe underextrusion.


It could be soemthing isn't tight enough in the extruder.  Or maybe you are printing too fast or too cold.  This is not an Ultimaker but an Ultimaker can push on the filament with about 5kg of force. That's a lot!  With an ultimaker here are max printing speeds...

Here are top recommended speeds for .2mm layers (twice as fast for .1mm layers) and .4mm nozzle:
20mm/sec at 200C
30mm/sec at 210C
40mm/sec at 225C
50mm/sec at 240C


So my question is: what's your layer height, line width (all of them), print speed (all of them) and nozzle temperature.  Does it exceed the volume of filament in the table above?  If not is there a way to tighten up your feeder so it squeezes the filament harder?

Share this post

Link to post
Share on other sites

Managed to do a test print this morning, it's still running as I type this, but it is already a huge improvement.

The key appears to have been the heat vs speed I didn't have the head hot enough for the speed and I spotted a mistake with the material diameter setting too.

If I have any more feedback I'll be sure to post it up. Thanks to both of you for your input, it's most appreciated. Hope this thread can be of use to others with similar issues.



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

    • Ultimaker Cura | a new interface
      We're not only trying to always make Ultimaker Cura better with the usual new features and improvements we build, but we're also trying to make it more pleasant to operate. The interface was the focus for the upcoming release, from which we would already like to present you the first glance. 
        • Like
      • 86 replies
    • "Back To The Future" using Generative Design & Investment Casting
      Designing for light-weight parts is becoming more important, and I’m a firm believer in the need to produce lighter weight, less over-engineered parts for the future. This is for sustainability reasons because we need to be using less raw materials and, in things like transportation, it impacts the energy usage of the product during it’s service life.
        • Like
      • 12 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!