Printing an efficient grid

[Joymaker]

Just now I tried to print a square grid, a grate for sifting gravel. Strange and inefficient things happened. It started making a bunch of little squares with space in between. Perhaps it was going to fill between them later, I'm not sure -- but this is so inefficient! I would be very happy for it to print the rows by sweeping back and forth and the columns by sweeping back and forth the other way, skipping extrusion as it passes over the rows, as necessary. Can this be done? Can I set any settings that would do this?

Abandoning that, I decided to put the columns above the rows, bridging them, instead of crossing them on the same level. Should still have enough structural strength, I believe. But another strange thing happened. No matter how many "shells" I specified, it would print some shells for each "row", leaving a tiny open space in the middle, and then it insisted on "infilling" that middle space, making a rapid, rattly, and highly inefficient movement. I even tried changing the infill angles from 45 and -45 to 0 and 90, to no avail. Still rattling. Is there no way to get it to make a bar by just sweeping back and forth? This doesn't have to be the world's most neat or beautiful part -- quick and dirty would be just fine!

The photo, a screenshot of what should be, and the STL file are all attached.

Thanks,
Ken

How it was printing (just starting, look closely)

[bbinnard]

I just tried slicing your part with a different slicer (Craftware) and it does the same thing. My guess is that is simply (no pun intended) how slicer logic works. My guess is there is nothing you can do to change how the squares are printed.