I bought Simplify3D. The very first print with it looked way better, with none of the missing sections, and with a little bit of filament diameter tweaking it looked as good as something coming off of my more extensively tuned Printrbot Simple. I will probably use it for the Printrbot as well, see how it compares to the latest stable slic3r.

Looks like I'm going to have to shim up the unused extruder on single color prints, as it drags through anything larger than the width between the nozzles.

However, my wife just saw the credit card statement and realized I bought a second printer, and is about to murder me. Would any of you fine gentlemen like to purchase this excellent printer? I would be willing to sell it at my cost, and include my improvised spindle holders for no additional fee. Free shipping, I kept the original box, incredibly lightly used, with all of the issues mentioned in the original post resolved.

I just don't want to sleep in the car tonight.