This is a unique spinning top I designed in Sketchup. It is designed to be printed in two pieces and glued together also to have an open space in the middle to test the spanning ability of the MakerBot Replicator. both top and bottom are printed at the same time then assembled with 4 drops of superglue at the "corners". I can also post separate .stl files for those of you who want to print it in two colors.

See it spin! http://youtu.be/m3AUyN1N6Ls

New version http://www.thingiverse.com/thing:31671

1. Print spinning top.stl (do not use raft or support)
2. Assemble with one small drop of super glue on the flat part of each "corner"
3. Align carefully and squeeze each of the four flat spots together
4. Wait for glue to cure and Spinn!

Notes

1. Do not use a raft, the parts on the build platform need to be flat and smooth so they can be glued together.
2. Be careful when removing from build surface. It is super strong when the structure is complete but It can be a bit weak before the top and bottom are joined together.
3. It will print with default replicator setting, but it will print better if you change the following settings:

Object infill of 50% Layer Hight of .2 (see screen capture of Gcode window)