Hello MattE
’Hairline’ is an instruction to the printer to print the thinnest line it can. As the printer struggles to do this, the line often gives out. It should never be used, in my opinion, for printing purposes. I usually assign a linewidth of 0.075mm, which works in most cases, although I have gone as narrow as 0.05mm in areas where the line-work is very close. Basically, ‘Hairline’ isn’t an actual width and you should always assign an actual width for printing, especially if you are using an unknown printer.
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