Parametric Stackable Classifier

When I saw http://www.thingiverse.com/thing:112117 by jetpad I said, hey, that looks like a gold classifier.

I wasn't the only one. Problem was that it didn't stack. Now it does. I also made the grid more customizable, as I figured a 10mm grid wouldn't work with .4-.5mm thick grids.

While it slows down printing, I have the grills passing through each other instead of stacked, and the stacking brim has an angled growth area so it should be able to print without supports.