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.

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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.