Accuracy?

[SeanFawcett]

What sort of accuracy (precision) should I expect with a 3-D Printer?

I recently purchased a (slightly used) Makerbot replicator Z18.

Generally I am pretty pleased with it but the accuracy seems questionable.

I have a part designed in Solidworks and opened with Rhino. The thickness, measured in Rhino is 0.090"

The thickness of the resulting print is 0.097". As a result two pieces don't fit together?

What kind of accuracy should I expect?

Is there anyway to calibrate this?

Thanks