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

Moisture in filamant?

Recommended Posts

Hi Guys,

At some point I hope to be able to answer as many questions as I ask :).

I have just switched back to an ABS spool that I last used around 3 weeks ago, it has been stored in zip locked back with a bag of siica gel in a cupboard in a heated room.

Last time I printed with this filament I tweaked the settings to get it to where I liked it and it printed well. This time I get burn marks in certain areas of the print. Listening to the print in progress I do hear a popping from time to time and I suspect that I may have moisture in my filament.

Looking at the prints - would you agree or would you say that it is likely to be something else?

I did read a thread about storing filament and some folk advising a few options - I think for the ABS I may get some airtight tubs also and put the zip lock back into the tub along with a few more bags of silica.

If it is moisture - should I remove the filament and chuck it in the trash? Stick it in a tub with a hundred bags of silica gel? Bake it? Seems a shame to waste it as I actually like the way this filiament prints otherwise.

Thanks in advance


ABS print with burn marksABS print with burn marks


Share this post

Link to post
Share on other sites


If filament with very high moisture gets into the heating chamber, then evaporates it very quickly and you can hear it crackle near the HotEnd. But I do not think the moisture such combustion residues generated in the ABS.

I suspect there are small crumbs from the previous PLA Filament (Residues in Bowden). ABS is usually printed with higher temperatures, which could be too hot for PLA residues. PLA can withstand high temperatures only at high print speeds, I think.



Share this post

Link to post
Share on other sites

Nylon sucks in moisture amazingly. When you print it you hear a constant crackle. It creates thousands of tiny holes which refract light and make clear nylon look cloudy. It does *not* make black spots. Those black spots are something different. I don't know that ABS absorbs much moisture.

I'm not sure what made the popping sound. Maybe you had a partial clog of some sort where pressure built up.

The feeder on the UM2 is made of black ABS and pieces of it can move along the bowden and come out into your print. Also ABS is very sensitive to overheating - I recommend 245C for ABS for beginners. I am also an ABS beginner - but I have read about 10,000 posts on this forum so I know a little. ABS will turn brown or black if heated a long time or high temp. I suspect 240C at 4 hours is plenty but not sure exactly.


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

    • "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!