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Print-In-Place Tendon Thumb
A two-segment robot thumb, 72 mm long, that prints in place. It has a clevis IP joint with a fused 5 mm pin running in a 6 mm bore (0.5 mm clearance) and two 2 mm flexor/extensor tendon channels that end in a tie window at the tip. The root pivots on an M3 bolt through a 3.4 mm clearance hole, so you can add a tendon-driven thumb to a servo or string-pulled robot hand.
🧩 Part of the SG90 Tendon-Driven Robot Hand (2-segment opposable thumb) kit.
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