Yet I manage to keep my tolerances +- 0.05 mm which is enough for everything but miniature printing.
I have asked for clarification on that answer regarding what is meant by "miniature printing" but in the meantime, I want to ask the general question.
What impact does dimensional accuracy of filament have on final print quality, and why? Does it vary between different filament types?
Put it simply: they say 1.75 mm with a +/- error of .05 mm. Which means your flow may vary +/- 2.9 % while you are printing creating blobs and such.
The smaller the filament tolerance, the more expensive the production costs.