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I just added an few lines in the FAQ’s about tolerances.
Sorry that just is not a good idea. Small aluminum High precision parts and large signs do not mix on any machine really.
The tolerance you are asking for is what is expected from a large machining company using $100k+++ machines with a maximum machining size of 10x7x3″, link -https://www.firstcut.com/firstquote.aspx, and https://www.protolabs.com/resources/faqs.
They promise no higher than .13mm, so expecting a sub $500 machine to beat there performance just isn’t really feasible.
So if you make a nice small machine for your high tolerance parts, and get something with low run out and a good tool you can get very high precision/accuracy. I doubt any sign you make would need .1mm tolerances, so Best is a second machine. Just to give you an idea of .1 outside the world of 3d printing. Milled wood changes size by about 4% depending on humidity, metal does depending on temp 500mm of aluminum changes roughly +/-.1mm for ever 5 degrees Celsius.