this is a quick shot of the main basic ones i use.
one is a diamond edged cutoff wheel,waaaaay more safe for plastic cutting than carbon/composite discs.
you should only use the carbon/composite discs when you have to cut metal,never plastic as it melts to itself and has a extremely high fracturing/shattering danger when used in plastic.this diamond edged one is one of the best/safest for cutting plastics.
the second is a sanding drum bit,with interchangable sanding sleeves.good for quickly taking out "flashing" after cuts.
the third is what i use more for "coring" plastic.the very tip also has teeth on it which helps "bottom out" the plastic when need be.this third bit is actually more of a router bit than a dremel bit but it's basically the same principle.
the diamond disc will set you back from 10-12 bucks(depends where you go)
the sanding drum should come with your dremel,if not,probably just a few bucks
the coring bit will set you back from 15-20 bucks.
hope that helps(though a wee bit late to the party
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