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.
I get that but consider when the worm is driving the spur upwards. The lower face of the worm is going to turn the bearing counter clockwise.but the upper face of the worm wants the bearing to turn clockwise. If there is enough play, the upper face won't touch and it won't matter. If there were (hypothetically) perfect engagement the cones wouldn't turn at all and would just slide on the two faces of the worm.