I have DID and I have a cutter memory piece (or more than one) . I sometimes end up cut.

the key to stopping it from happening is to think about when in your lifetime you were a cutter and why.

DID separated pieces of memories come from abuse and are the content of an abuse situation locating that will tell you how to stop it.

once you know that you can pay attention to the trigger that makes you rerun that piece of memory. so that you can us grounding techniques and so on when you encounter that trigger.

If you are like me - amnesiac DID - meaning not co conscious with that piece of memory (alter) - no awareness until you develop the ability to be co conscious with that memory piece - so you have no memory of what the cutting or being cut during an abuse situation is you can still locate your trigger by writing in a journal what you remember right before you dissociated and then noticed the cut.

The last thing remembered before dissociating into a memory piece is your trigger.

Then use grounding techniques, and relaxation techniques when you encounter that trigger/situation again and the cutting will not happen when you are unaware.