Fused Deposition Modeling (FDM), or Fused Filament Fabrication (FFF), is an additive manufacturing process that belongs to the material extrusion family. In FDM, an object is a 3D printing process that uses a continuous filament of a thermoplastic material.
Filament is fed from a large coil through a moving, heated printer extruder head, and is deposited on the growing work. The print head is moved under computer control to define the printed shape. Usually the head moves in two dimensions to deposit one horizontal plane, or layer, at a time; the work or the print head is then moved vertically by a small amount to begin a new layer. The speed of the extruder head may also be controlled to stop and start deposition and form an interrupted plane without stringing or dribbling between sections.
FDM is the most widely used 3D Printing technology: it represents the largest installed base of 3D printers globally and is often the first technology people are exposed to. In this article, the basic principles and the key aspects of the technology are presented.
1. The technology is clean, simple-to-use and office-friendly
2. Supported production-grade thermoplastics are mechanically and environmentally stable
3. Complex geometries and cavities that would otherwise be problematic become practical with FDM technology
All the frequency division multiplexing channels get affected due to wideband fading. A large number of modulators and filters are required. The communication channel must have a very large bandwidth. The frequency division multiplexing suffers from the problem of crosstalk.