If you're looking at controlling the paste printing process, height is only
one variable - albeit probably the most commonly measured.  However paste
volume and registration are what drives a "good" joint provided the
environment is controlled (humidity/temperature/time on stencil), parts are
solderable, proper pad layout, ...etc.  So height gives you one dimension,
but for example if your apertures aren't fully releasing paste you could wind
up with the correct height but a poorly defined brick of paste lacking in
volume.  Printer setup, stencil cleaning frequency, time between prints,
print speed, tooling location, stencil fabrication method - chem etch, laser,
polished are all variables to printing.  Anyway. Steve's post re: metal
blades is right on.  Just pay attention to the rest of process - height
measurement alone won't characterize or control  paste printing.

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