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In depth idiot
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Other than when cutting through external parts (when a razor saw or sharp knife is the tool of choice) I rarely use anything but the dremel, and often with the flexible drive. The cutter of choice is a milling head about 10mm diameter with fairly coarse teeth, about 2.5mm pitch. At high speed this chips the plastic out, rather then tending to melt it, a particular problem with abrasive discs: one moment cutting, and the next producing volumes of plastic 'candy floss'. Some polymers cut best if left to chill for 30 minutes in the freezer, between attacks.
 
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