Most plastics used in 3D printing tend to accumulate moisture (hygroscopic). In its turn, the presence of moisture in filament will cause boiling of the liquid during printing, which will result in an uneven supply of plastic and as a consequence in a defect in the quality of the final part. Some types of plastics are less sensitive to presence of moisture in the surrounding space, but for a better surface quality it is recommended to store plastic filaments in places with a minimum amount of moisture. The solution of this problem is to use a dryer before printing.
Carbon fiber, which is part of the composite bundle, accumulates less moisture than plastics, but it is also a hygroscopic material. Similar to plastics it is required to choose spaces with minimum moisture content in the air for its long-term storage.
NOTICE: do not use heater dryers for Anisoprint CCF (Composite Carbon Fiber) and CBF (Composite Basalt Fiber). Being heated above 40°C for a long time (more than several minutes), carbon and basalt fibers become brittle and improper for printing.