Is there a good way to get carbon to go tightly round a right angle?

Thanks

Just remember if you cut down the corners, you will need on the structural layers to cut it differently so it doesnt just break on the corners. eg wrap a length of carbon around the 4 sides then use a blob spray tack to hold it.

better still, use a long tow of carbon to in effect tie around the box rather than glue.  it will lay flat nicely and not effect cosmetic finish.

You will find it much easier to use profinish carbon when doing complicated cuts as the edges of normal carbon will fray easily looking messy.

ideally pre-preg would suit such a part as it is sticky so would cut nicely and hold itself in position while you lay up.  However i understand cost may be prohibitative.