Nothing elegant or unusual about this one at all, just plumbing..

• Triangle : Mesh 3-circle, origin to mid Y.
• In a row,every other triangle rotated by pi*index
• Duplicate rows, every other row flipped by Y scale -1
• Welding, face-flipping, to tidy up
• All scaled at end to input edge-length

Options to fill, and point up / point down, for triangle 0.

Nothing elegant or unusual about this one at all, just plumbing..

• Triangle : Mesh 3-circle, origin to mid Y.
• In a row,every triangle rotated by pi*index
• Duplicate rows as instances, every other row flipped by Y scale -1
• Welding, face-flipping, to tidy up
• All scaled at end to input edge-length

Options to fill, and point up / point down, for triangle 0.