crescent shape made by inverting an ellipsoid on a sphere

thingiverse

This is a beautiful crescent shape created by flipping an ellipsoid onto a sphere. The pictures show the ellipsoid in bright yellow and the crescent shape in vibrant green, with the sphere serving as the underlying framework. A hole has been drilled into the top for convenience, allowing the pieces to be glued together and forming a container. However, the real focus is on the intricate shape itself. If you're interested in rebuilding this from scratch or making modifications, here's the necessary toolchain: 1. Run octave (available at https://www.gnu.org/software/octave/), using the files "surfplane.m" and "savestl.m" to generate stl files. Execute the octave file blob33_2.m to create the two stl files "blob33_2_outer.stl" and "blob33_2_inner.stl". The first is the outer surface of the shell, while the second represents the inner space. You can print these stl files if you prefer, but they lack certain features. 2. Run "blob33_2.scad", which combines the two stl files into a hollow shell that's split in half and gets an added lip. It also creates a top and bottom. The process of making lips in general employs the Minkowski function, resulting in a lengthy completion time.