Jump to content
Ultimaker Community of 3D Printing Experts

UMO+ stange stretched prints in z-direction / z-axis issue / layers larger than set?

Recommended Posts

I experience a very strange behavior: prints are getting "strechted" in z-direction. It looks like the z-axis is moving downwards more than wished / defined. Printer is UMO+. I used Cura 3.4.1, layer height was set to 0.2 mm. Actually in the past few weeks I had often prints with not bonding layers. I assume this is related to the z-axis issue. I have never seen or experienced such an issue in now 6+ years experience with UMO printers. Any ideas what the root-cause could be and how to fix it would be very much appreciated. Or anyone else with the same problem?


In the image you see on the left the desired print result of a phone case from an UM2+, on the right the same print with same settings on the UMO+.





Share this post

Link to post
Share on other sites

Well steps/mm is probably set wrong.  Did you update the firmware on the UMO recently?  Some versions of Marlin have a "motions settings" menu somewhere in there and you can view and set steps/mm.  Fix that value by moving the bed 100mm and measuring how far it actually moves and dividing the difference and correcting the steps/mm of the Z axis by that value.


If you did update the firmware maybe you have UMO firmware on a UMO+?  They have different Z steps/mm I think.  Often you have to do "factory reset" to load all the defaults of the new firmware properly (loading new firmware sometimes messes up all the eeprom saved settings).


You have the white circuit board, right?  There is a jumper near the center of the board that can affect steps/mm by 2X.  If that is loose and jiggling that could cause it to occasionally step 2x but this seems very unlikely.

Share this post

Link to post
Share on other sites

Many thanks gr5 for your feedback. I have not updated the firmare of my UMO recently. Also I had not seen that issue in the past.


I have made some slicing tests with Cura 3.4.1. and compared with 3.3.1 when slicing for UMO (incl. heatbed) and for UM2+. Very interesting results which may show an issue in the slicer in Cura 3.4.1. Below you'll see the calculated slicing times which are odd for the UMO in v. 3.4.1 as they differ by almost 80-100% for an UMO vs. the time for an UMO2+:


Example STL 1:

Cura 3.4.1: on UMO: 3:18h on UM2+: 1:41h

Cura 3.3.1: on UMO: 1:59h on UM2+: 2:08h


Example STL 2:

Cura 3.4.1: on UMO: 5:08h on UM2+: 3:02h

Cura 3.3.1: on UMO: 2:58h on UM2+: 2:14h

Share this post

Link to post
Share on other sites

-- Issue solved ---


I found the root-cause in the z-steps/mm settings on my Ultimaker Original with original heatbed (use the Ulticontroller Control > Motion)


- old: +0200.0

- new: +400.1


I have saved the settings then via Control > Save or store memory. 


Source / similar issue:


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
      • 87 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!