Just a quick note today about silkscreen and how to make a success of it. Bigger silkscreen is easier to manufacture so if you can get away with larger characters and wider lines, go for it. The team here will appreciate you saving their vision too (microscopes are expensive).
But if you have a small product and still want silkscreen there are some parameters you might find useful. There are two ways to put silkscreen onto a PCB. A conventional squeegee and screen, or the more expensive automated computer controlled inkjet printer.
Squeegee and Screen: Font Size 30 mil x 30 mil, with a 6 mil draw (line width)
Inkjet Printer: Font Size 20 mil x 30 mil, with a 5 mil draw (line width)
Remember, these are minimums, so you're still pushing the process. If you design a little larger then your silkscreen will fit comfortably within the process window.
I hope you find that useful. As always, if you have any questions, please feel free to get in touch. My email address is firstname.lastname@example.org and our phone number is (413) 397-8260.