I’m curious to know what everyone one the forum uses. So I thought that it could be helpful to all to see this. Please feel free to add your choices. Make a choice based on what you know has worked or will work for you.
Wohoo a poll! Havn’t seen one of these on here for awhile. I like to use compression router bits on the mill.
My favorite method out what you polled is the sledge hammer. It’s really fun to break stuff. 
Just not entirely effective.
Have you seen this recent thread on trimming?
It depends on the part for me. If its a straight part I’ll usually use a diamond cutt of bit on a dremel. If its a mroe curvy part I’ll use a IR reciprocating saw. For very curvy parts I’ll use a trim fixture with a router.
I use the dremel routing bit. It doesnt cut well and it makes a very very loud squeeling sound against the carbon fiber. Anybody have any better luck with a routing bit?
I’m amazed so many people selected water jet. That many people have 5 axis water jet cnc’s?
I was thinking the exact same thing.
I did recently spend some time at a shop that had two. It made me sick. 
The reason for this is that thread pointed by you. This way the poll could generate some surprises even for experts in cutting composites.
For instance we don’t have a water-jet, but we use all other means, depending on application but we can get water-jet cutting done outside. Our 4 axis mill usually uses a mix of cutters, single-two-and-three edge diamond bit tools (the cutting type rather than abrasive), some tungsten carbide with PVD coating… circular saws, cut-off wheels, bandsaws, hand held jigsaws (oh damn, forgot to add this one 
). But I found for pure composites, its hard to beat abrasive-water-jet. However, getting it done by someone close by can get expensive. The moment we have a metallic plate embedded in a composite, for instance aluminum 2024 against or titanium in carbon, even abrasive water jet can give heartaches, since the difference in densities and cutting characteristics can cut one layer and give a problem in the subsequent layer which can sometimes aggravate to a de-lamination of the metal/composite boundary.
So back to that sledge hammer 
N
Does anyone else use Compression router bits?
Moved to Equipment Talk due to subject matter