Coaster with centered Chi.

jpg -> tracebitmap (inkscape) -> svg -> tinkercad -> blender (smooth) -> tinkercad (cut flat bottom) save as stl.
This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/3v6cva5Mqed

using with script
https://www.thingiverse.com/thing:2077884