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Are you going to do the silkscreen printing yourself or are you going to order it from a professional? If you're ordering it, is the professional a specialist in making PCB prints or are they general silkscreen printers whose normal work is printing posters? The minimum track and space widths depend a lot on these factors.
There are no specific limits on track and space sizes. It depends on your skill in printing thin lines evenly and how much you can avoid smudging. Professional PCB manufacturers can usually print lines as small as 6 mils (about 0.015mm) with spacing of the same size, and some can do even smaller sizes. If you're doing it yourself with manual tools, it may be best if you limit them to about 15 mils (about 0.04mm) for both track width and spacing.
As you gain more and more experience, or if you're very talented, you may be able to use widths down to around 10 mils. There is really no maximum size as far as the printing work is concerned. That's more a requirement of the circuit. For example, a long large track may have too much inductance for certain high frequency considerations. And too small a track may not be able to handle high currents. High voltages need to have good clearance from adjacent tracks.
I hope these pointers have given you some idea of the various factors that should be considered.
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