You scared me there! I thought maybe I messed up.
After thinking about it though, I'm switching the input to the power supply, which is 120VAC. The output is 12VDC, 20A.
There's no way the printer takes 20A input current, I only have a 15A breaker for the whole room.
I'm not at the printer right now, but I'm guessing it's close to 3A.