So, you have to own a Zortrax M200 in order to win one? The purchase being necessary to win turns this from a contest into a lottery.

1. There is a prize.
2. There is chance involved in winning
3. There is a purchase required.

That makes it a lottery. I certainly hope Zortrax thought this through legally. I know they are a Polish company and don't know if they have a presence here in the US where the law would be binding.