I pasted a couple of them together - printing now - we'll see.
To avoid the collision issue when the head would move from the top of one piece to the base of the next, I inserted a G1 move to get the head and fans over in the X direction before it slants down to start the next piece.
Editing the gcode is kind of a PIA workaround, but I shouldn't have to do it very often.
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Slic3r also has this functionality;
@Jonathan: For sorting order, I'd lean towards shortest-to-tallest, as the taller an object is, the more likely it is to run into whatever mechanism is moving the print head when the next model starts.