Also, look into Logical Level MOSFET's that turn on most of the way at 4.5V or lower. They can cost a little extra each, but are great for being driven by normal logic levels. If you dig around you can often find some 30V 60+A MOSFET's in the $0.30-$0.60 range in qty (the price does go up quickly in the qty needed for a single 3D printer from some suppliers).
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