In thick airtight zip-loc bags with silica gel packs wet filament dries out over time.
This is a roll of SR-30 soluble support material, that I bought second hand. SR-30 is very
hygroscopic, similar to PVA. The roll was manufactured in 2017 and printed very badly. Lots of steam bubbles
in the extruded filament, excessive oozing, blobs and zits on the support structures.
Mojo filament cartridges (they are called Quickpack Print Engines) are sealed in aluminium coated pouches and contain about 200 gramms of desiccant. The original pouch had some holes and the desiccant was already spent. I removed the lower part of the pouch and replaced the spent desiccant with fresh regenerated silica gel.
After two month of drying inside the zip-loc bag with three new sets of silica gel packs the moisture level of the air inside the pouch is now at 6% relative humidity. Recent test prints with this roll of SR-30 were successful and produced no steam bubbles, only a little oozing (which is normal for Stratasys printers and dealt with by wipers and brushes) and acceptable support structures.
When the filament is already dry I have to regenerate the silica gel packs every two to three month in a hot air oven at 110°C to maintain optimal print results. This also applies to Stratasys ABS-M30, TitanX and PETG. They print best when they are bone dry.
If there is enough time silica gel packs and thick plastic bags will dry filament in a safe and reliable way.
Thick plastic bags with a moisture barrier are highly recommended.
Mojo Quickpack Print Engine stored in thick zip-loc bag with silica gel packs and a hygrometer
This post was modified 2 weeks ago by Pete