How FDM works: Process starts with a 3D CAD model sliced into thin layers in Z-axis. These sliced layers are used to drive an extrusion head of FDM machine. The building material, in the form of a thin solid filament, is fed from a spool to a movable head controlled by servo motors. Second filament is fed from adjacent nozzle for support material, used to give support for overhanged or cantilever features. The filament reaches the liquifier head, melts it and then extruded through a nozzle onto the part surface. After covering the whole cross section build platform descends by one layer thickness to lay down the next layer. Process repeats itself until full 3D part is formed. The temperature of machine chamber is precisely controlled below the melting point of the material so that only little amount of heat is required to melt the filament and on the other hand part need to be kept cool enough so that the molten material solidifies upon contact. FDM parts are suitable for strong and functional testing exposed to temperature, water or chemicals. These parts have almost 80% of the strength of injection moulded ABS material.
FDM (Fused Deposition Modeling)