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I found a new interesting equal-edged torus today by excavating two J92's out of an icosidodecahedron
Has anyone ever made this before?
I never read Stewart's toroid book, maybe it's in there?

Nice. I'm not familiar with it offhand. It's not immediately obvious that J92 should reach exactly halfway into the icosidodecahedron. Interesting.

You should have a look at Alex Doskey‘s website. He studied Stewart’s book thoroughly and he has lots of such toroids:

polyhedra.doskey.com/stewart00.html

Ulrich

Thanks Ulrich for your suggestion, I actually did find his website last night and there are numerous interesting things there, but I didn't see this example. Really I need to get a copy of Stewart's book, like Alex said on his website it's really most useful as a supplement with the book.

I actually thought of this excavated icosidodecahedron because of something I saw on http://eusebeia.dyndns.org/4d/J92, he shows there that the J92 reaches the halfway point of the icosidodecahedron.

I found another interesting one yesterday:
This is a J91+J63 Tunnel through a J32 (Pentagonal Orthocupolarontunda)

I realized then that J32 had a cross section of 2 of those irregular hexagons that Stewart talked about inside a Rhombicosidodecahedron.

So I created a new toroid that has Stewart's quasi-convex property that doesn't seem to be mentioned in his book (I only have first edition, though): This is J76 with a rotunda and two icosahedra removed for a genus of 2.

That one's nice. Seems unexpected that the icosahedron should align like that.

Even better, I got one with a genus of 6 and retaining the original symmetry of J76 by cutting through with a Dodecahedron and 5 J11s
Still quasi-convex!

Yep very nice. J76 minus a dodecahedron and 5 diminished icosahedra.

And an alternate version with antiprism and cupola replacing rotunda: