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Rotating Gondola Line Arm
A 64 x 36 x 6 mm swivel arm from the 'NEMA17 Hanging Wall Polargraph Drawbot' kit (print two). Its 22.8 mm chamfered bore turns freely on the Ballast Gondola Pen Hub's 22.0 mm pen sleeve, so each drive line stays aimed at the pen axis at every hang angle. The line ties off through a 2.5 mm countersunk eyelet 40 mm from the axis, and a 1.5 mm knot groove on the top face seats the knot.
🧩 Part of the NEMA17 Hanging Wall Polargraph Drawbot (free-swinging line anchor aimed at pen axis) kit.
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