"Lay Flat" command?

I there a command to make an object "Lay flat". Lots of slicing software has this feature, but for the elementary classroom I'm working with, we'd like to get everything prepped before it goes to the computer controlling the printer (which is the bottleneck in our operation).  Alternatively, if there is no Lay Flat command, is there a way to measure the angle a flat surface makes with the work plane? Eyeballing a students design flat isn't accurate enough.


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