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Razor saw will do the same job.

Can be got for less than $10 if you shop around (many model stores stock them. Excel and X-acto make them).

Steady hands, and patience are also requirements, but you can't buy them - they need to be learned.

Proper use of English and less hostility might get you more help. That or a few more years under your belt.

They're overkill on plastic though.
You have to use a speed so low that you may as well just do it by hand anyway - if you go too high, it'll just melt the plastic and not cut/grind.