That's pretty cool SilverPotato!
From the way it moves, it almost seems like an evil twin, but that's obviously just because of the extended pieces.
It doesnt really seem like a "triangle" to me. More of an extended octagonal barrel.
Never the less, awesome.
Notice how it's called the truncated triangle. Basically, the tip(s?) are cut down, but if they were not the puzzle would look like a triangle head on.