I think the first thing to check here is the mesh, there is a hole in the plate where the nozzle appears to touch it. Refining surfaces here should do the trick.
Secondly, the pressure outlets allow air out. However, the direction of flow is actually more along the x-direction. This means that a flow will be induced and therefore will have to go both in and out of the boundaries. This can be achieved with the custom inlet-outlet condition. This might take a few attempts. Alternately, we could increase the bounding box size to encompass the setup, simulating the printer kinda in a big room.
Let me know how it goes,