Always look at your part in layer view before you print. Otherwise some letters may have gaps or not print at all. And if you really are pushing the limits with nozzle width < .35 I also recommend flow > 100%. Typically 150 or 200%. And also be very aware of the "first layer thickness" parameter which defaults to .3mm.
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gr5 2,224
I model the part .1mm high and tell it the bottom layer is .1mm and it works fine. The problem is your width. .25mm is narrower than the .4mm nozzle. In fact Cura won't print anything less than .8mm wide if your shell and nozzle are set to .4mm.
I've printed things skinnier than .8 - maybe down to about .6 by lying about he nozzle width. I set both the nozzle width to a smaller value (I hate going lower than .3 so try that) and the shell has to be a multiple of the nozzle width (so .3 or .6).
Then after the text is done I do a cold pull, change filament, and print a part on top. The part on top - I don't bother removing the text from it - I just print it flat on top. The key is that the white part in the pictures above has a bottom layer of .3mm and the red text has a bottom layer of .1mm such that the MUCH THICKER white bottom layer just flows in and around the text and it manages to fit (even though in theory there's not enough room - it just manages fine).
To get .1mm thick text you have to level SO much better than normal - I don't use the leveling procedure to get it perfect - the leveling procedure gets you close - then I do the rest by turning the knobs while it's printing the skirt. Once it's at the right height it stays there for months.
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