MakerBot Replicator 2X Troubleshooting And Maintenance page 30

LEVELING BUILD PLATE
You should level your build plate regularly,
especially if you notice that your extruder
nozzle is scratching the build plate, or that
the first layer of an object doesn't adhere to
the plate. Each time you level, you should also
make sure that your build plate is clean: dust,
scratches and oil from your hands can cause
some of the same problems as a plate that's
too far from the extruder.
Here are a few tips to keep in mind when you
level your build plate:
• Make sure to take your fingers off the
leveling knobs and platform when you
test the friction on your paper or feeler
gauge; pressure from your hands can affect
platform height.
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• If you're having trouble leveling your build
plate, make sure your nozzles are clean.
Small amounts of plastic stuck to the nozzles
can make it feel like the nozzle is closer to the
plate than it really is. Wrinkles in the Kapton
tape can also yield confusing results.
• Printing at lower layer heights might
require the plate and nozzle to be a little
closer together. If you are printing at a
lower layer height than you were previously
and the first layer of your print isn't sticking
well to the plate, try turning each leveling
knob about a quarter turn to the left.