*READ: Important note about Nylon*

Note: Legacy documentation is no longer being updated. For up to date instructions, see our Desktop Series support articles.

The Mark One Composite 3D Printer™ uses a specially tuned nylon PA6 copolymer for the Fused Filament Fabrication (FFF) printing process. While nylon is an amazingly tough engineering plastic and works very well with our Continuous Filament Fabrication (CFF) fiber materials, it is very susceptible to absorbing moisture. nylon that has absorbed too much moisture will cause a number of printing issues like failed prints, under-extrusion, holes in the roof of parts, etc. Please take special care to NEVER leave nylon exposed to ambient air, and ALWAYS keep nylon in the provided Dry Box.


  • NEVER leave a nylon spool exposed to ambient atmosphere.
  • DO NOT open a nylon spool bag until you are ready to use it.
  • Make sure your Dry Box is FULLY Latched and Closed.
  • If you are planning on leaving your Mark One / material unused for an extended period of time, just keep the spool in the Dry Box with the filament loaded in the printer. The Dry Box & desiccant do a good job protecting from moisture, and Dry Box-stored material should last up to a year before the water content is too high for printing. When re-starting a machine after a long idle period, run the Wet Plastic Purge Print utility until it stops steaming (which may take 2-3 runs).
  • If you are planning to travel with your printer, unload the nylon, remove the PFTE tube from the DryBox, and use the provided Red Plug to seal the container. Learn more here.
  • Do Not open the nylon Dry Box unless absolutely necessary. If the Dry Box must be opened, make sure to minimize the exposure time.
  • Please inspect Nylon bag for any holes or tears prior to using.