Monoprice extrusion i3 13860 User Manual page 14

21. Now that the printer is off you can manually move the extruder around the build
platform. Because most printing is done near the center of the platform, you should
check the nozzle height at points about 2 inches from each corner, as indicated by
the blue X marks in the diagram below.
Use a single sheet of ordinary printer paper as a guide. The nozzle is at the correct
height when you can just slide a single sheet of paper between the build platform
and the nozzle.
To raise the build platform, loosen the wingnuts under the build platform. To lower
the build platform, tighten the wingnuts under the build platform. Note that you
may need to slightly squeeze the platform to more easily tighten the wingnuts.
Continue adjusting the platform height until it is at the correct height at all points
on the platform.
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