MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
1.2mm seems ideal for .3, .4, and .6 nozzles. I used a .4 nozzle and print at .3 line width for better definition. I am understanding more nowadays that there are some .5 nozzles and .25 nozzles, so 1.5 would likely be better for them, though 1.6mm on a .4 nozzle drastically increases estimated print time verses 1.2mm, so I can't attest to how well 1.5mm would actually work.