Jump to content
Ultimaker Community of 3D Printing Experts
dmahalko

Is PVA always a headache?

Recommended Posts

This is basically our first ever use of PVA. Brand new roll of Ultimaker PVA straight out of the shrink-wrap, loaded this afternoon on an Ultimaker 3 Extended.

 

ThingiVerse: Spiral Chess Set with hollow base

 

Results about 80% of the way, appear to be... not great.

  • PVA "chunks" scattered all over the bed, falling off from ... somewhere.
  • PVA filament blobs all around the object.
  • PVA tail seen sticking out about 5mm from the extruder head while it is using the PLA.
  • PVA extruder head is completely carbonized black..  it was new and unused about 5 hours ago.

 

PVA headache.png

Share this post


Link to post
Share on other sites

The bits of pva all over the place is 100% normal.  Unfortunately.  and the tail.

 

However you should be using the default settings which include "horizontal expansion" set to 3mm.  And I don't think you are using that.  I find it a bit dangerous to have pva start and stop like it does in your print but if you increase horiztontal expansion then pva will have a path through itself down to the glass.

 

If you don't have a path down to the glass then you have pva sitting on top of pla which works but not as well.

 

Anyway this particular part does not benefit from pva as much as some parts do that have much larger, more serious overhangs.  Like say a boat propeller would have.  A boat propeller benefits greatly from pva.  A totem pole benefits also but not as much.

 

But, yeah, pva is kind of a pain.  It doesn't behave as well as PLA.  PLA sticks to itself when still liquid.  Like mucus or snot.  PVA not so much - more like cement.  Or peanut butter.  When it's wet it can hardly hold it's own weight.  One of the results is bits of pva chunks everywhere.

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

    • How to 3D print with reinforced engineering materials
      Ultimaker is hosting a webinar where we explain how you can achieve and maintain a high print success rate using these new reinforced engineering materials. Learn from Ultimaker's Product Manager of Materials and top chemical engineer Bart van As how you can take your 3D printing to that next level.
      • 0 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!