Jump to content
Ultimaker Community of 3D Printing Experts

Belt maintenance

Recommended Posts

I assume you mean the long belt? If it's the short one you simply loosen the four screws that hold the stepper motor in place, press down firmly on the stepper and then re-tighten.

For the long belt; is the belt slack on both the upper and lower part of the loop? If it's just one side you'll have to loosen one of the pulleys that the belt runs across so that the pressure can equalise and then re-tighten the set screw again (firmly!).

If that's not it something must've happened inside the slide block. The slide blocks contain a spring that should keep the belt at the proper tightness automatically. Unfortunately it's difficult (if not impossible) to open those up without snapping at least one of the little tabs that keeps it shut so I would maybe try to improvise some external belt tensioning device. Not sure how much space there is to work with though.

  • Like 1

Share this post

Link to post
Share on other sites

If the slack is on both the upper and lower part, get some of these:


Set the X and Y axis in the middle of the printer, loosen 1 pulley, add the spring above the slide block, tighten the pulley again.

Be sure that the most flat side is at the slide block, otherwise the belt can touch the axis.




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

    • 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!