Jump to content
Ultimaker Community of 3D Printing Experts
FréderickMatheuse

PVA - Printing problems with oozing and 'Schrapnel' on the buildplate

Recommended Posts

Dear Ultimaker Community,

 

I'm having some problems printing complete structures with PVA, which I want to use as a sacrificial mold for further research, but also when I use PVA solely as support material. During printing, oozing results in bad quality prints and thus a low quality mold, but I also notice that my buildplate lies full of small parts of PVA (schrapnel) after printing (see pictures 1 and 2).

I try to print a porous structure consisting out of cubes, which need to have support between them (see picture 3). The dimension of the support is often very small, around 2-4 mm wide. After printing the support part, some PVA is still extruded from the nozzle creating these small schrapnel. When the printer changes his printcore from PVA to PLA, this schrapnel that hangs from the BB 0.4 printcore touches the print and detaches. Most of the time, these parts are distributed over the buildplate and are not a problem, but sometimes they stick to the print and are integrated in the final structure when the next layer of PLA is printed over them.

 

I've read already the humidity problem, which might be an issue in my case.

Are there any other reasons that might cause this problem? Are there ways to solve this?

I also notice a lot of oozing problems when printing with PVA as build material. Might it be possible that PVA is not optimized for this and only works as support material?

 

Kind regards,

Fréderick

20180404_092044.jpg

20180404_092047.jpg

Cura - support.PNG

Share this post


Link to post
Share on other sites

I am using the BB 0.4 core for PVA and AA 0.4 core for PLA, so that should be good.

 

I am using following settings:

- Layer height = 0.06mm (since my structures need to be as small/smooth as possible)

- Shell, wall thickness 1mm

- Infill 20%

- T = 215°C

- Build plate T = 60°C

- Print speed = 35mm/s

 

And for support:

- Support density = 50%

- Support Infill Layer Thickness = 0.18mm

- Support interface resolution = 0.06mm

 

Let me know if I forgot some parameters ;)

Thanks!

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

[[Template core/front/global/_customFooter does not exist. This theme may be out of date. Run the support tool in the AdminCP to restore the default theme.]]
×

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!