I can create a Menger sponge fractal using geometry nodes.

See Blender file below:

Now I'm trying to create a Sierpinski Dodecahedron

I tried to replace the cube node with a Dodecahedron created as an object but that didn't work

I can create a Menger sponge fractal using geometry nodes.

See Blender file below:

Now I'm trying to create a Sierpinski Dodecahedron

I tried to replace the cube node with a Dodecahedron created as an object but that didn't work

The goal is to create the Sierpinski Dodecahedron fractal that can be sliced into several sections and 3D printed out.