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So, I downloaded a "calibration model" from thingiverse and printed it:
http://www.thingiverse.com/thing:24238
9485

Each step is 5mm cubed. After printing it I measured two rows of steps in...

Thanks, the dimensions in mm are:

The part is nominally a channel shape, with the following section: 45.72mm wide, 19.05 mm high with a wall thickness of 2.29 mm. The 45.72mm dimension measures...

Thank you for the reply. Yes, you are correct, we are talking about precision...

I have not applied a shrinkage, not sure if there are rules of thumb for this... I suppose I could calculate some...

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...