There is a 2D Pi
I successed transformed it to 3D.
extrudeImage[image_] :=
Block[{res, img},
img = DeleteSmallComponents[Binarize[image, 0.9], 500];
res = ImageMesh[img];
RegionProduct[res, Line[{{0.}, {10.}}]]]
img = DeleteBorderComponents@
ImageResize[Import["https://i.stack.imgur.com/AM0gC.png"], 100];
r = Region[extrudeImage@img, Axes -> True,
AxesLabel -> {"X", "Y", "Z"}];
r = TransformedRegion[r, TranslationTransform[-RegionCentroid@r]]
I tried to rotate it to create a more 3D Pi, but the surface seemed to be too rough, MMA can't export STL format.
RegionUnion@
Table[TransformedRegion[r, RotationTransform[i, {0, 1, 0}]], {i, 0,
Pi/3, Pi/10}]
Export["test.stl", %]
How to make the surface smooth so that 3D printer can be used?