I have tried to use heated pen-knife to rework/mod-work on some plastics
part.

Though this method can be fast but the finishing is bad.  Additional
finishing is needed as the cut-surface is rough.  My process is a simple
flame-heated knife (to shape or cut) or pipe (to reduce diameter).  Any
tips? or advise? or comments?

To polish up, some cutting and shapings, I am thinking to load up some
Dremel accessories, but the information on using Dremel to work on plastics
is very lacking.  Now I wonder is Dremel the wrong choice?  If it is not so,
what are must-have accessories to help shorten the purchasing process as
well as to save some dollars and iterations.

Thanks.

Ling SM
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