For years I wanted to print a spintop. But with the geared motor extruders this was not possible because the pointed tip while being printed would accumulate too much heat and melt away. With a geared motor you can't control the exact amount of extruded material which is just what you need to do when you want to slow down in the upper layers to give the plastic more time to cool down. Now that we have stepper motor based extruders it's possible so I just HAD to create this object using OpenSCAD :)The snap fit handle (needed to keep the lower part flat and printable) was inspired by the printed axis in the "Screwless Cube Gears" by emmett http://www.thingiverse.com/thing:10483 If you have a well calibrated printer the handle should snap fit right into the hole in the spintop. I printed using skeinforge and so the hole came out a little bit too small. Instead of making the model smaller which would lead to problems for the people whose printers print to spec I filed down the handle a little bit to snap fit it in.Assemble the 2 pieces and have fun!