Jump to content
brandonbrayRRS

Repeatedly skipping same layer while printing

Recommended Posts

Posted (edited) · Repeatedly skipping same layer while printing

Hi,

We've just set up our first printer, Ultimaker 2+, and for the most part it's worked great. But it consistently skips one layer while printing. I've posted about it as a reply to another thread that sounded similar, but it hasn't shown up. So I'm starting a new topic to hopefully have it seen and see if if any of you can help.

In the picture below, you'll see a sample part with a skipped layer approximately 11.5mm (.45") from the base, making it layer 191 or 192, as every layer is .06mm thick according to my settings. Just below it is a ridge where I expect some PLA has squished out from the build plate not dropping enough or at all for that layer. After the gap, the printing continues as normal and the final height is to print. All other dimensions are to print, as well.

After consulting the troubleshooting page, it appears the build plate's linear bearings could be binding on their shafts, as the skipped layer is very consistent from part to part. I attempted to adjust the bearings as explained on that page, but it hasn't seemed to help. Is there a more reliable way to adjust the bearings, or something else I can try?

Thank you for your help!

Best regards,

Brandon Bray

20160318_112246_2.jpg

Edited by Guest

Share this post


Link to post
Share on other sites
Posted · Repeatedly skipping same layer while printing

There have been a few reports lately with lumpy bearings and or sloppy z axis nuts.

I would first check your model in layer view just to make sure its all good.

Then raise and lower the bed up and down by hand to see if you can fee a tight spot. its normally repeated at a set distance as the balls complete one round of the inner race inside the bearing.

Next you can raise and lower the bed small amounts without the z axis turning to check the play in the z nut.

You may needs to remove the linear bearing individually from the bed and raise them on there own to feel any problems.

If you want to print something in the mean time just put a weight on the back of the bed and see if that helps.

  • Like 1

Share this post


Link to post
Share on other sites
Posted · Repeatedly skipping same layer while printing

I have the same problem. With a micro meter I measured the move of the bed and saw that it was not linear. The combination of not so solid bearings and a nut without anti backlash gives these gab. My nut has a backlash of 0.15 mm.

The bed remains for a momend at the same position so you put 2 layers on the same position. This gives you also an edge at the outside of your print.

I ordered a nut with anti backlash and waiting for it. When I have build up the system I will post the result here.

Share this post


Link to post
Share on other sites
Posted · Repeatedly skipping same layer while printing

Today I made my first prints with the anti backlash nut and it was a great succes. no gap and a smood surface. Every layer seems to have an equal thickness now.

IMG_0166.thumb.JPG.edd496dd048d2076a70d3d780c9d2e52.JPG

IMG_0166.thumb.JPG.edd496dd048d2076a70d3d780c9d2e52.JPG

  • Like 3

Share this post


Link to post
Share on other sites
Posted · Repeatedly skipping same layer while printing

Today I made my first prints with the anti backlash nut and it was a great succes. no gap and a smood surface.  Every layer seems to have an equal thickness now.

 

Looks great. Where did you get the anti-backlash nut?

Share this post


Link to post
Share on other sites
Posted · Repeatedly skipping same layer while printing

I get it from ooznest.co.uk/

Some picture how i did it

IMG_0160.thumb.JPG.8c8dc04543eb76a5c39e993a029c4fcf.JPG

IMG_0161.thumb.JPG.becdae4cb8013ddcaf1f280f5bd7d1b9.JPG

IMG_0162.thumb.JPG.e21116bed57fc2be02e2a88ca8a20846.JPG

IMG_0163.thumb.JPG.def55ad3462f75f623767000ba3f7328.JPG

IMG_0164.thumb.JPG.b84497b5b0a7e6fcfa43381980877a91.JPG

IMG_0165.thumb.JPG.7c4f17d7e62e4ad60b2f1e03cdb207b2.JPG

IMG_0160.thumb.JPG.8c8dc04543eb76a5c39e993a029c4fcf.JPG

IMG_0161.thumb.JPG.becdae4cb8013ddcaf1f280f5bd7d1b9.JPG

IMG_0162.thumb.JPG.e21116bed57fc2be02e2a88ca8a20846.JPG

IMG_0163.thumb.JPG.def55ad3462f75f623767000ba3f7328.JPG

IMG_0164.thumb.JPG.b84497b5b0a7e6fcfa43381980877a91.JPG

IMG_0165.thumb.JPG.7c4f17d7e62e4ad60b2f1e03cdb207b2.JPG

Share this post


Link to post
Share on other sites
Posted · Repeatedly skipping same layer while printing

Almost. I of course solved the problem of different hole positions with a 3D printed part... ;)

  • Like 1

Share this post


Link to post
Share on other sites
Posted · Repeatedly skipping same layer while printing

The result is almost the same. The difference is with brass you need grease and with delrin plastic oil , less friction.

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!