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.
This gadget was created to help students learn how ratios work, in a hands-on way. The "T" on the gears stands for the number of teeth. So, if you connect the 8 tooth gear with the 16 tooth, the 8 will go around twice for one revolution of the 16. The arrows are just there to help line things up. Additionally, by adding a middle gear you can prove that the ratios stay the same, but the direction changes.
Hope that helps,