Jump to content

round prints are oval

Recommended Posts

Posted · round prints are oval

Hi all,


I am printing on a Ultimaker 2. bought appr. in 2014.  This is not my first Printer. But to be honest I never build one. I bought them assembled so I am not SO much into it. 


I am printing since quite a long time. This off chause does not mean I may just make a stupid mistake. As I have no Idea and as I could not find a topic wich solves my problem I dare to post this as a new topic. 


I am printing allot of round stuff. I have printed parts with thread, bottels and all kind of stuff. Also very fine threads with pitch of less then 1mm w/o problem. Allway with perfect roundness and very good accuracy. 


Since a few month all my prints are not round anymore. They are more like a oval. Squared objects are not correct in XY measures.

I calculated a little bit and it seems like all my prints are perfect in X axis. A 80mm round object stays perfectly 80.0mm in X axis. 

While the Y Axis measures appr 1% less. So a 80mm round circle measure in Y direction only 79,2mm. 

Wich results in a oval shape. 


I checked the belts and they are not loose. I did not use a beld spanner so fare as they realy did not seem to be lose. At least there is no noticable difference in Y and X . Also the motor belts are stiff have strong tention. 

As I have a Ultimaker 2 I tend to think that there should be no movement in the housing, so that I should not need to check angels of the housing..  I hope... 


Does anybody has a Idea what may chause this? 


One thing wich "may" be related to this is, that every movement in Y the printer ratles. Like if something is scratching somewhere. I am oiling my rails every few weeks so this should not be the reason. 


I am very happy to hear your thoughts. 

Thank you so much! 





Share this post

Link to post
Share on other sites
Posted · round prints are oval

Look straight down from above the printer - do the two rods going through the head look perpendicular?  


Push the head around with your hand to the center of each of the 4 sides. Do the end blocks seem to stop at the same time or is one block offset?

Share this post

Link to post
Share on other sites
Posted · round prints are oval

Hi, thanks for bringing up this topic... I checkt it actually measured it and found that the axis are not 90°. From what I measured on a distance of appr. 80mm I have 1.3mm deviation from 90° angle of my old scool triangle roller.


Wow. I did not expect this. What can be done to solve this.

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

  • Create New...

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!