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.
Yes thicker would be stronger but the trade off is that it's firmer so not as springy. Using more shells and/or infill will help. Filament quality also makes a difference. Not all PLA is the same. Lower quality tends to be more brittle.