Jump to content
Ultimaker Community of 3D Printing Experts
macio

Bug: Offset (layer shift) between first and second layer when printing PLA + PVA

Recommended Posts

We upgraded Cura and Ultimaker firmware to latest version recently (Cura version 3.4.1, Ultimaker 3 Extended firmware release from 29.5.18)
Since then, printing a model with PLA using PVA as support material results in a layer shift between first and second layer.
See attached pictures, model is not printed with a brim, the single layer at one site is shifted but part of the model.

20180716_150313.jpg

Edited by macio

Share this post


Link to post
Share on other sites

90% of the time this is a loose pulley.  First figure out if it slipped in X or Y.  Then tighten all 6 pulleys (SIX - not four). on that axis.  The most likely problem pulley is the one on the stepper.  You should be able to get it with a long handled hex driver (it's okay to push the print head around to get access to the set screw).

 

Tighten the hell out of those pulleys.  If you are using an L shaped allen wrench with the short arm for torque it should hurt your fingers a lot after.  A lot.  Tighten it so much you are scared.  The steel shaft should be twisting slightly.

 

If you don't believe me you can mark the shaft and pulley with a sharpie such that after a layer shift you can see if you are right or I am right.  Sometimes the problem is high friction or overheating stepper driver (is it above 20C in the room with the printer?) but overheating stepper driver problems usually occur after an hour of printing - not just at the start.  Push the head around with your fingers to feel the friction.  If one axis seems worse then oil it.  Oil them anyway.  Just a tiny bit of oil.  Too much oil is bad.  One drop on each of the 6 steel rods in the gantry.  Any light oil is fine.  Don't use WD40.

 

 

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

    • 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...
      • 1 reply
    • "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!