Jump to content
Ultimaker Community of 3D Printing Experts
Sign in to follow this  
anthonyt

Odd wall thicknesses

Recommended Posts

 

I have these odd wall thicknesses (about 2.25mm and 1.75mm) on my plots where I need a consistent wall thickness of 2mm:

defaultsettings_zpse2303e19.jpg

Here is the OpenSCAD code that I used for testing to produce the image above.


difference(){
union(){
cube([8,20,4]);
translate([8,4,0])cube([4,12,4]);
}
translate([2,2,0])cube([4,16,4]);
translate([6,6,0])cube([4,8,4]);
}

I am using the default profile in Cura 13.06.5.

My initial guess is a rounding issue in the slicer.

 

Share this post


Link to post
Share on other sites

Have you actually looked at the coordinates in the gcode file? I just tried slicing this in Cura 13.06.5, with 0.4mm nozzle size, and 0.8mm wall thickness and it came out spot on.

I wonder if perhaps the problem you're seeing is due to head positioning inaccuracy, perhaps due to backlash, or some sort of alignment or pulley eccentricity issue?

 

Share this post


Link to post
Share on other sites

I think I got it working now. The X-axis belt at the motor was fairly loose and could not be tightened without filing out the motor slots on the back board. It is printing those walls properly now!!

Obviously I started this topic in the wrong section.

 

Share this post


Link to post
Share on other sites

The bottom layers, the first 1 or 2 mm tend to come out not as good - they tend to get what some people call "elephant's foot". The bottom most layer can't shrink because it's squished into the tape but each layer above that shrinks a little bit more until it eventually settles down. So I would print at least 3mm before measuring.

 

Share this post


Link to post
Share on other sites

The bottom layers, the first 1 or 2 mm tend to come out not as good - they tend to get what some people call "elephant's foot". The bottom most layer can't shrink because it's squished into the tape but each layer above that shrinks a little bit more until it eventually settles down. So I would print at least 3mm before measuring.

 

In this case, it was not the squishing as one section was thinner than it should be. I had not expected the slop in the X motor belt to produce consistently measurable differences.

As I tightened that belt, those two dimensions started coming together. I just needed to file out the slots about 2mm longer so that the motor could be moved to properly the tighten that belt.

Anyway, I am very glad that it is working nicely.

 

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
Sign in to follow this  

  • Our picks

    • Introducing Ultimaker Cura 3.6 | Beta
      Ultimaker Cura 3.6 | Beta is available. It comes with new features, bug fixes, and UX improvements. We would really like to have your feedback on it to make our stable release as good as it can be. As always, you can download the beta for free from our website, for Windows, MacOS, and Linux.
        • Like
      • 95 replies
    • Print Core CC | Red for Ruby
      Q: For some users, abrasive materials may be a new subject matter. Can you explain what it is that makes a material abrasive when you are not sure which print core to use?
      A: Materials which are hard in a solid piece (like metals, ceramics and carbon fibers) will generally also wear down the nozzle. In general one should assume...
        • Like
      • 30 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!