Mechanism for cutting string

I’m not sure if this is the right sub, but I’m working on an Arduino project to cut hundreds of strings (relatively soft string, max 4-5mm thick) to length. I’ve been thinking about it for a while, but I can’t come up with a simple but reliable mechanism that wouldn’t either be massive or hard to make. I’ve thought about salvaging some pre-made mechanism, but I couldn’t think of anything that would have something close to this except hacking a pair of scissors, which seems a bit too hackt for me.

Anyone have any good ideas?

Touch here for the full post on the Arduino Apprentices tumblr

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