Crystal Star Tree

This was designed as part of a light defuser for a Christmas decoration, but the result was a bit of a surprise. OpenSCAD's linear_extrude() added facets to the result in an interesting and attractive way, especially when printed using a shiny material. I used translucent PETG but PLA should work as well.

For OpenSCAD-wise folks: I've provided knobs for height, the radius at the base, and the number of points in the star that is extruded. You can adjust the faceting by changing the $fn value for the linear_extrude. (Set it to 512 to see the result I originally expected.) There are other things you can play with, such as the angle of the twist (you'll need to adjust the rotation of the hollow form as well) or the depth of the furrows (i.e. the length of the star points).

The star polygon was my first foray into recursively-defined shapes; feel free to steal it.