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Diameter tolerance

The diameter tolerance indicates how much the actual thickness of the print string, i.e. the filament, may differ from its stated standard diameter, which is most often 1.75 mm or 2.85 mm. The tolerance value is indicated as plus/minus, for example "±0.05 mm". This means in practice that a filament with a diameter of 1.75 mm will actually have a thickness between 1.70 mm and 1.80 mm. The 3D printer is set up to feed material into the nozzle based on the assumption that the filament has a constant diameter along its length. If the thickness of the filament varies, so does the amount of material being extruded. Where the filament is thicker, the printer prints more material, which can lead to bumps and inaccuracies on the print surface. Conversely, where the filament is thinner, less material is printed, causing gaps between layers, poor cohesion and an overall more fragile model. Therefore, a smaller tolerance value, such as "±0.02 mm", indicates a more consistent filament diameter, which ensures a more uniform material flow and results in dimensionally accurate and smoother prints.

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