How can I remove a small section of crown molding?
 

I need to remove a small section of previously installed crown molding, without boogering up the ceiling and wall in the process.

The section in question meets an outside corner of 120* and the person who installed it mitered it as if it were a 90* corner, then left the corner incomplete. The pieces of crown are too long and unwieldy for me to take the whole thing down and reinstall it myself.

The only thing I can think of is using a cutoff wheel of some sort on a Dremel tool. But have never had much luck with those flimsy wheels.

Any other thoughts?

The Fein Multimaster would do the trick. There are knock-offs from Dremel, bosch and maybe others that might work.

If you have a hand grinder, get a segmented diamond blade. Mark a line across where you want to cut it. Then use the diamond blade to cut into the molding center out till you cut through enough to get a flush cut saw in there. Finish with a flush cut saw. If you are careful it will be as straight as possible and no damage to wall. There is no way to get a nice clean cut with it attached. Good luck.

Boy, that thing sure looks handy.
But I am not sure I want to spend that much money to install a 2'-0" section of crown....

That multimaster (and similar knockoffs) is a handy little tool....Thinking about getting one myself....You might not want to spend the money just for this particular project, but I'm sure you'll find many other uses down the road. May be worth reconsidering.

Can anyone name/recommend a decent 'knockoff'?

Harbor Freight has a single speed and variable speed. $39 and $59 if you have a coupon. Works well.

Very nice suggestion! :) That thing can absolutely do it.. :D

OK, I have another question:

How can I mark a square cut line on the crown?
Any angle tools I can think of are too long to use in this application....

Use a block of scrap wood, just make sure the scrap corner is 90 degrees.:)