We will not discuss any of the other 3D printing technologies, like Digital Light Projection (DLP), Stereolitography (SLA) and Selective Laser Sintering (SLS),etc. The reason is simply that FFF printers are by far the most common 3D printer type used for home 3D printing, i.e. desktop 3D printers.
If you are considering buying your own 3D printer, an FFF is most likely the 3D printing technology that you will end up using.
Note that FFF is a synonym of Fused Deposition Modelling (FDM) – both terms describe exactly the same technique. However, Fused Deposition Modelling and its abbreviation FDM are trademarked by Stratasys Inc, one of the major 3D printing companies.
Fused Filament Fabrication is nothing but a fancy word to describe a process by which a machine deposits a filament (picture something like a small string) of a certain material (normally thermoplastics, wax or similar products) on top or next to the same material, in order to create a joint by heat and/or adhesion.
Thermoplastics are plastics which become semi-liquid above a specific temperature and return to a solid state when cooling down.
An FFF printer prints a 3-dimensional object by extruding a stream of heated or melted thermoplastic material, which is carefully positioned into layer upon layer, working from the bottom up. Just imagine a heated print head that is oozing out a permanent flow of molten plastic onto a surface in order to form, through multiple layers, the virtual object you chose to print. By adding layer upon layer, which will almost immediately harden upon leaving the hot print head, you will see the object that you chose to create materialize right in front of you.
The parts of your print which would be floating on air are called “overhang“. Check out the next Illustration to see the identified “overhangs” – the red circles.
In order to overcome this problem, you can choose (or, depending on your software, these parts are automatically detected) where to print a support structure.
Check out the 3D printed cat model below. You could never have printed this object with an FFF printer if youdid not use a support structure.
Printed cat with supports:
Look at the next three pictures to understand the value of printing with a dissolvable filament:
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