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# Helix with radius s, inner radius 2s
define @b (3 * s) / 2
define @a @b / π
-4*s <= x <= 4*s
-4*s <= y <= 4*s
-s <= z <= 2*s
(ρ - 3*s)^2 + (z - @b - (@a * φ))^2 <= s^2 \
∨ \
(ρ - 3*s)^2 + (z - 3*s - @b - (@a * φ))^2 <= s^2 \
∨ \
(ρ - 3*s)^2 + (z + 3*s - @b - (@a * φ))^2 <= s^2