Open chain of N truncated dodecahedra curled around an edge (violet axis), free ends. Roll accumulates 720° (or your total). Drag N to find where the curl locks decagon-to-decagon. Drag to rotate · wheel to zoom.
Locking N for 720°: 5 (144°), 10 (72°), 20 (36°). At those N every cell advances by a whole decagonal-face click and chains in registration; the registration-mismatch strain term goes to zero, so the burn runs cleanest. Off-lock N pay a mismatch tax. Model only — sim-scaffold, not canon.