Jump to content
Ultimaker Community of 3D Printing Experts
Sign in to follow this  
tim-antos

Possible z-axis problem

Recommended Posts

Hi. I’ve been printing away on my ultimaker for a while now and managed to solve my issues along the way using the various forums. However I’m now suddenly having weird problems which seem to be related to the z-axis I think. I’ve scoured the forums to no avail, hoping you can help!

Essentially after printing the first few layers fine there seems to come a point where the z axis no longer moves down. The machine carries on moving and trying to deposit material however it soon starts to grind along material already laid down and is no longer able to deposit more filament as it’s flow is blocked by the solidified plastic.

I have taken some pictures to illustrate the problem.

On the left of the first pic is how the first layers should look (ignore the under-extrusion of the body – this happened as the spool jammed). On the right is how they are now turning out, note the support structure has merged into a solid. In this case I had to abort the print as it was not moving in the Z-axis at all and beginning to grind heavily across the print.

The second picture is two prints printed before and after. Not with the second the print has a lot of excess plastic on the raised outcrop and it is not as high. In this case the print actually managed to finish but not to the correct height.

I have tried all sorts of things to rectify this including:

· Tightening the coupling on the z-axis screw thread

· Levelling & re-levelling the bed many times

· Tightening & checking all grub screws

· Checking the extrusion roller and spring tension

· Reinstalled Cura and Firmware

· Greased Z axis & lubed the others

· Checked the fan’s working ok

Help would be greatly appreciated as it’s driving me nuts!

photo

photo (1)

 

Share this post


Link to post
Share on other sites

Using cura (or pronterface - it's free!) move the z axis down in 10mm steps. Measure this roughly with a ruler. Does it look correct?

Is it only moving 5mm possibly? (always consitently half the correct amount? failure mode 1)

or does it sometimes less than 10mm and then other times work fine?

Does it get stuck?

If everything is fine then rehome and move down 1mm at a time for 10 times. Did it move the full 10mm?

If everything still fine, put a ruler on the back corner of the machine as close to the bed as possible. Tape it there securely. Place a pencil or flat ruler or something on the bed so it reaches the ruler. Move the bed down in 1mm and .1mm increments. Test it carefully.

 

Share this post


Link to post
Share on other sites

Oh and maybe you can send us a photo of your z coupler (at the bottom of the z screw).

Please answer all the questions that were in the earlier posts. They are all good questions and we need to know this before giving more advice.

 

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
Sign in to follow this  

  • 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!