Jump to content
Ultimaker Community of 3D Printing Experts

Knurled bolt removal

Recommended Posts

Which printer?  I don't know how to do it for the um2+ but for the UM2 it's pretty easy and obvious - just loosen the set screw on the side.  I think it's a 1.5mm hex.


Hi there

It is a Um2 extended

I loosened the grub screw and completely removed it, but for the life of me even with pliers I cannot remove the knurled bolt, I have tried shocking it and using penetrating spray.

Should it literally just pull off?

Thank you in advance

Share this post

Link to post
Share on other sites

Finally managed to remove it

Took the motor down to the garage, clamped up the bolt in a vice and used a punch and mallet.

I have no idea why it was stuck on there so tight.

Swapped it for a mk8 driver gear and so far am impressed with the results over the knurled bolt

Share this post

Link to post
Share on other sites

It was probably loc-tite from the threads. I've had a few of those that were impossible to remove without significant force. Heat would probably work as well but I was in a hurry.


Yeah it was a pain, had the same on my other Ultimaker 2 as well.

Also am using your low friction spool and uprated filament guide, great work :D

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

    • Architect Design Contest | Vehicles.
      We're open for entries! - Design and submit your 3D designs of architectural entourage - vehicles - for a chance to win a large filament pack. Presenting an idea, an architectural design or something as big as an urban project isn't easy. A scaled model can really help to get your idea across.
        • Like
      • 24 replies
    • What The DfAM?
      I'm Steve Cox, an experienced engineer familiar with 3D printing. I wanted to share some DfAM guidelines with this community to help and make stronger parts.
      I'm also an Autodesk Certified Instructor for Fusion 360, so many of the images in ...
        • Thanks
        • Like
      • 23 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!