How to dehydrate PLA Filament

Published on in Category 3DPriting


After 6 or more months, PLA Filaments become brittle and break easy. This make the filament not suitable for use. In our observation we found it happens irrespective of your region/climate or manufacture. Only the time may wary based on atmospheric parameters of the place where the filaments are stored.

The main reason for brittleness of filament is due to moisture absorption. ABS, PLA, and other common filament materials are mildly hygroscopic, so they will readily absorb moisture from the air. This is especially true if you live in a humid environment.

Symptoms

Below are the some of the most common symptoms that your filament has absorbed some moisture.

  • Brittle and break easily
  • PLA filament swell and cause your hot end to jam. In worst case jams require hot end replacement.
  • Trapped moisture inside the PLA filament, becomes stream inside hotend which then interfere with the flow of plastic
  • Printed objects are weak
  • Makes a rough/grainy surface on finished prints
  • Filament is making a popping/cracking/hissing sound

If your filament is making a popping/cracking/hissing sound, or makes a rough/grainy surface on finished prints, your filament has probably absorbed some moisture. ABS, PLA, and other common filament materials are mildly hygroscopic, so they will readily absorb moisture from the air. This is especially true if you live in a humid environment.

Solutions

The most simple way to remove the moisture is to place the entire roll in an oven for 2-3 hours at 185°F (85°C).

Warning: Many ovens do not have a temperature setting this low. If the oven temperature is much higher than 200°F, the fibers can cling to each other and ruin the roll.

A safer, but less effective treatment is to place the roll in a airtight container or bag with desiccant packs, salt and/or rice for several days or more.

[or]

Alternative is to Dry the filament in hot sun, in India it is hot enough in summer.

Once the filament is dried it is ready for use.

Prevention is better than cure, To prevent the filament from absorbing moisture in the future, keep your filament stored in an airtight container with a desiccant.

More online resources: How Store Filaments , PLA filament moisture problem and solutions , Dehydrating Filament , Dry PLA filament in car



TAGS: troubleshooting howto filament pla

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