Have you looked at the printer's advanced properties dialog? (Assuming these are still a thing?) I haven't owned a printer in years but my last one (some kind of Epson) had options to control the half-toning.

Maybe try feeding it a vector instead of a raster then

Not sure how to feed a vector short of doing raw PostScript.

PDF is, or at least can be, a vector format. Or go for PostScript. EPS is a perfectly respectable format as well.