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Problems affecting the quality

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In no particular order...

Print speed - the faster you go the lower the quality

Resolution, i.e. layer height - the thinner you go the better the quality

Extrusion flow - i.e. tuning speed vs layer height vs. extrusion temp. I.E. within arrange of, say, +/- 5 degrees there is an optimum temp. for a given combination of layer height and print speed. When I am testing a new filament I will gradually reduce the extruder temp until I see under extrusion and then I will increase by 5 degrees. If that is good I will reduce by a couple of degrees and see which is the best between the two; if the same I will always go with the cooler temp.

Keep all print speeds the same - yes there will be certain models where you will just not want to do this, but every time you change speed this will affect the pressure needed in the feed system and the stabilisation of this is not instantaneous so you will briefly under/over extrude which can cause surface artefacts

Filament quality - you get what you pay for; cheap filaments give you cheap results

Different filaments - from different manufacturers often need different optimum settings for the same print; the same applies to different colours from the same manufacturer, the colour dyes impact performance.

Hardware - maintain it so it is performing optimally, particularly the feed system (again filament quality can affect this)

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