It's 30 loose pieces and each has pins and holes so that they form tetrahedra. As i built it i kinda had to wrangle it because the tolerances were tighter than I expected, but the whole thing is pretty solid which is neat since there's nothing holding the tetrahedra together. If you look you can also see that every tetrahedron has each vertex going through a face on each other tetrahedron.

A neat fact about this shape is that the vertices of the 5 tetrahedra are also the vertices of a dodecahedron! So I made a second version with string holes:

I messed around in desmos to find the right angles so that the holes are actually pointing at each other and not just normal to the surface.

I made two, because the tetrahedra actually have chirality when arranged like this! So the two models above are mirror images of each other, and you can see how in one the tetrahedra spiral clockwise, and in the other they spiral anticlockwise!

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ok, so I figured I should do more dev-posting, so here's the newest feature in the complex hex experimental branch : Expressions & Parametric Lines/Surfaces

Expressions are exactly what they say on the tin, a mathematical expression that can have values substituted in, ex.

order of operations is jank because the expression is stored as a tree, so evaluation goes left to right rather than in bodmas order or whatever

This allows for the second feature: Parametric Lines & Surfaces Again, exactly what it says on the tin, The parametric line pattern takes in a position as the origin of the curve and three expressions that represent the x, y & z components of the curve and it spawns an entity that renders the curve by substituting in a t-value and drawing a line connecting the points

(I forgot to get an ingame picture, so pretend these two are ingame and fancier.)

Parametric surfaces take in the same arguments but evaluate the expressions at different uv values to create a surface. The triplet of expressions above creates this curve:

(This curve is yoinked from one of the Desmos 3d examples.)

and for both the line and surface, the expressions also have the x, y & z coordinates and the game time substituted in, so shenanigans are possible