Makerbot optimized Mendel print pattern

I am hoping to finish my Makerbot Build next month . My plan to to go into full serial production of Mendels. My goal is to have 3 Mendels, and 1 Makerbot all going full blast producing Mendels.

Most people I see printing Mendels are printing 1 part at a time, but is that the most efficient way? What I WANT to do is print my Mendels this way

-Segment my prints into 2 hour chunks. Try to organize the parts into groups that

-Utilize 90% plus of the print area on each print

-Figure out what is the most efficient number of Mendels to print at once. Is there an advantage to printing 6 of 1 part at a time?

Since different parts have different tolerances for variation, would their be an advantage to using different aperture extrudes for different parts?

Many of the parts will take over two hours to print, so a lot of your batches will be only one part. Many of the smaller parts you need multiple copies of. I believe most people are using the Multiply tool in Skeinforge to print these parts. That only leaves a few parts that can be printed in less than two hours and you only need one of.

I try to avoid grouping prints that take more than 4 hours. My machine is still new and I haven't gotten it super reliable. The odds of a failure in a 6 hour build is high and all the parts on the bed would have to be junked (unless some are short). Printing one object at a time reduces the cost of failures.