If the filament has been exposed to excessive moisture, it may feel soft and sticky. The most effective ways to dry PVA are described on this page.
When storing the PVA in a sealed bag or box, add a few bags of fresh desiccant (silica gel). These will absorb the moisture and ensure that the PVA maintains its dryness level.
Heating the filament
If the PVA has absorbed too much moisture, you can also dry the filament by heating it.
- Heat the build plate of your Ultimaker to a temperature of 45-55 °C
- Put the filament spool in its original packaging (in a cardboard box, without the plastic bag), and place the box on the build plate
- Let the filament dry at the set temperature for approximately two hours
- After two hours, take the filament from the build plate and let it cool to room temperature before using the material in your printer
Caution: Do not use a household oven.
Tip: This procedure of drying filaments can be applied to other moisture sensitive materials, such as Ultimaker Nylon, Ultimaker TPU95A and Ultimaker PC.