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Given that, a printer is well-maintained and calibrated.

I'm searching for a particular nozzle accuracy and filament quality test:

  • First, is there a specific print test that can be performed to test the quality of the nozzle alone, based on the visual results? Can that be reflected in a score of some kind, a metric reflecting the nozzle quality?
  • Secondly, is there a specific print test to test the filament quality, not strength properties, solely based on the visual results? Can that be reflected in a filament quality score or metric?
  • Lastly, are there "known good" standards that results could be compared with?
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  • $\begingroup$ What exactly do you mean by "quality"? $\endgroup$
    – Mołot
    Commented Nov 28, 2023 at 13:37
  • $\begingroup$ Perhaps nozzle (diameter) accuracy is a better term. $\endgroup$
    – Bob Ortiz
    Commented Nov 28, 2023 at 14:13

1 Answer 1

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Mostly a Relative measure

Assuming you have a well-known, well-printing nozzle and filament combination, then you can print a benchmark print, change one factor and then test with altered settings.

One of the most ubiquitous prints for a benchmark is Benchy. Benchy isn't so much a calibration test, but has all aspects you need in a benchmark. Overhangs, rounded corners, sharp corners, small diameter parts and sharp corners followed by longer stretches: it's all in there! and with those one gets a decent idea of print quality for other parts.

Another typical benchmark test is a cube, which has the sharp corners and stretches.

Depending on which factors you switched, you get a resulting relative quality comparison between the two prints. But you won't get a measurable metric, unless you invent a score based on artifacts.

Filament factors

Among the factors that would show up based on bad filament. The three most noticeable I can think of are:

  • hissing, bubbling & gaps can indicate wet filament
  • stretches of random underextrusion and motor skipping can indicate uneven filament diameter
  • sudden stalling of the extruder and no extrusion indicates a bulge on the filament

Nozzle factors

Nozzle problems generally are systemic and would show up on the whole print.

  • clogs from bad machining result in systematic underextrusion or no extrusion at all
  • too large a nozzle shows in a larger print
  • too small a nozzle shows in bad wall-to-wall and inter-layer adhesion and extruder skipping
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