But carbon and glass fibers are added to such filaments in a milled form. Such filaments are stronger, stiffer, and show less shrinkage than basic thermoplastics. They are two-component materials consisting of thermoplastic and carbon- or glass-fiber filler. In recent years, so-called composite, or more correctly, filled filaments, have become popular in 3D printing. But with the correct load calculation and the appropriate algorithm for laying the fibers, it is possible to obtain lightest parts with the strength concentrated in the proper areas and maintained at the corresponding load angles. It looks like anisotropy of the material could be considered a disadvantage.
For example, carbon and basalt fibers feature very high tensile strength along the fibers, but it takes much less force to break them across.
Anisotropic materials, on the contrary, are characterized by different properties in different directions. Isotropic materials have the same mechanical properties in all directions, regardless of the load angle.
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