Inspired by the physics of frame-dragging in space-time [ https://en.wikipedia.org/wiki/Frame-dragging ], I created this model. While the model can be printed on a single extruder printer (like the C2), the need for support material everywhere makes for a messy clean-up job. This model is best printed on a dual extruder using PVA as support material. On low resolution quality, it takes around 24 hours to print on the C2. I used the 'cross' shape support selectable in Cura. With a bit of imagination: a spinning black-hole is at the center of the model, the model shows what happens to space-time as it approaches the black-hole.