Jump to content
Ultimaker Community of 3D Printing Experts

UMO printing head moving randomly

Recommended Posts


I have had my UMO for almost 4 years and use it intensively. It was working very well until recently.

The problem is that after very few correct layers the printing head moves away 5-10 millimeters and keeps trying to print where it shouldn't. After it moves a little It keeps moving away from where it should be printing. It moves away from the print in both axes X and Y, In the photo below you can see the printing head trying to print about 5-6 cm from where it should be.

I have checked all the pulleys which are tight on their axels. I have added belt tensioners and both the short and long belts have good tension. The guiding rods for the printing head are all properly tightened.

I have check all the mechanical parts and everything seems to be OK.

What else could be going wrong? Can both motors (X and Y) be malfunctioning at the same time?

Or could it be an electronic problem? maybe motor controllers? What should I check?

I have never changed the belts. But they have good tension and they don't slip even if I lock the motor axle and apply moving force to the print head.

Sorry about the bad photo, but it's just to show how much the printing head has drifted from where it should be.

I really need some help with this, as the printer is totally useless now. I have a UM2 and UM2+ too, but I need to use this UMO as well


Share this post

Link to post
Share on other sites

That's one of the thinks I was thinking about. The fan is working BUT, it used to be very noisy, specially the first minuted after turning the printer on, and now it doesn't make that much noise anymore, although I feel it is spinning. The fan noise stopped around the the time the problems started, so it could be related.

How heat could be affecting this random movements?

The damage doesn't seem to be permanent, as the first few layers (a couple of them) are correct.

Should I try to change just the fan, or anything else should be changed? how could I test if it is really a heat problem?

Share this post

Link to post
Share on other sites

Hi spiruline,

Check your power supply, the power supply is one of the units that’s work "hardest" in the printer. If the voltage drops down, your fans will suffer so will the steppers, but the processor will still works as it use own regulator delivering 5 volt DC as long the input (your 12 V DC supply) is more than approx 7.5 volt DC.

Just my 2 c.



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
      • 130 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!