Infill
Infill is the internal lattice structure printed inside a 3D object to give it strength without filling it completely solid.
Infill is the partially hollow pattern printed inside a model's outer walls. Expressed as a percentage, it trades material, weight, and print time against strength: more infill makes a part stronger and heavier.
Most functional prints do not need to be solid. A moderate infill gives plenty of strength while saving filament and time, which is why infill is one of the most important slicer settings to tune.
Slicer
A slicer is software that converts a 3D model into the layer-by-layer instructions a 3D printer follows to build the object.
Layer height
Layer height is the thickness of each printed layer, which controls the trade-off between surface detail and print time.
Filament
Filament is the spooled thermoplastic material that an FDM 3D printer melts and extrudes to build objects.
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