I found an awesome deal on a carbon seatpost but its 400mm long and I only need it to be about 230 to 240mm. Can I safely cut it down to that length. Its already alot lighter than my current at 400mm but this is weight weenies. I need a quick answer.

I've done it ... no problem. I know some I've heard it's not adviseable (edge/enve? - can't remember)

Just remember to measure the minimum insertion amount and cut down from the seatpost collar mark leaving that much room. I saved about 15g off a 270mm post...

good luck, it seems intimidating, but it's not that bad once you get into it.

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Check minimum length marking, make sure when you cut that you leave same minimum in frame.
Best to use a carbon specific blade, or get your LBS to cut it for you.
Seems like most WW's cut seatposts to reduce unnecessary weight.
I went from 197 to 160g on my Enve seatpost saving 37g

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Ozrider - Western Australia
Parlee Z5 XL 2011 (6055g/13.32lbs) Raleigh RC Ltd 2008 (7.6kg) Reynolds 653 Custom 1990 (9.8kg, now 8.8kg)
The accumulation of marginal gains is what makes the difference between winning and losing

Thanks guys as I should be able to cut 160 to 170 mm off and that should save me some serious weight.

Be careful to not inhale the dust.

The seatpost needs to extend past the bottom of the toptube. Other than that, you'll be fine.

Either use a carbon fiber cutting blade or a new 32tpi blade. You can also wrap the post in masking tape to avoid splintering

I going to get my LBS to do it. I just wanted to make sure it was safe

Some cf seatposts have a clamping area. If you cut off the clamping area, you can't safely clamp it anymore.

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"Nothing compares to the simple pleasures of a bike ride," said John F. Kennedy, a man who had the pleasure of Marilyn Monroe.

I cut my Ritchey Superlogic down without any problems. Definitely use masking tape and be careful of the dust. I used a hacksaw with a fine tooth blade - no splintering at all.

I had to cut my girlfriends post on her carbon synapse to get the seat height low enough. I used a light cut-off wheel on a dremel and followed a guide line of some tape that i used to keep it even. It cut through it like butter. I wouldn't hesitate to cut another seatpost. Do the math on the minimum amount and wear a mask - i wish i would have, the dust gets everywhere and can't be good for you.

You could also use one of those saw guides intended for fork steerer cutting to get a clean line.