Most printer use .4mm nozzles, so your lines must be at least that wide. You can fudge slightly by telling the slicer you have a .39mm nozzle and that will help print lines that are exactly .4mm wide, but not less.
Well you can actually change the line width to 0.33 on most cases (using 0.4). I also have done 0.25mm using 0.4 but ofc to keep the material flow going I had to print 0.25 layer height for that trick.
Also when playing with line width lower than the nozzle you need a perfectly ok extruder that doesn't mind lots of retractions so you avoid any dripping moving from a to b. Basically is harder, but doable if you spend time tunning your settings.
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DaHai8 74
The limitation is probably your printer, or more exactly your printer's nozzle size.
Check the width of the lines in your characters. If they are narrower than your nozzle size, they will not print - no matter what slicer you use.
Most printer use .4mm nozzles, so your lines must be at least that wide. You can fudge slightly by telling the slicer you have a .39mm nozzle and that will help print lines that are exactly .4mm wide, but not less.
So basically, the only way to print small letters with narrow lines is to use a smaller nozzle size, eg: .2mm, .25mm, .3mm
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