 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 servomotors. 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.
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