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.
1st layer was TOUGH. I recommend slowing the printer WAY down, then turning it back up after drawing the outlines of the squares.
Jar size? I used "Power of Pi" with a aluminum coated mylar cup. The Power of Pi needs to be scaled down to 79mm diameter (or so).