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Bowden Tendon Guide Block
This guide block is part of the 'SG90 Tendon-Driven Continuum Trunk Arm' kit (print ×3). It takes a 4 mm OD PTFE Bowden tube in a horizontal 4.3 mm bore, 22 mm deep, at z = 8. The bore steps down to a 1.8 mm chamfered fairlead for the 0.8–1.0 mm braided tendon, which keeps the line aimed straight from its capstan into the tube. The block is 30 x 12 x 14 mm. Its 5 mm side ear has a 3.4 mm hole and clamps in the deck's radial slot with an M3x12 screw, a washer and a nut, so you can slide it and swivel it into line.
Trunk Root Plate
This is the root plate of the 'SG90 Tendon-Driven Continuum Trunk Arm' kit: a Ø76 x 8 mm disc that bolts to the tower's top flange with 3x M3 at R34. It clamps the 4 mm OD PTFE backbone in a 4.3 mm bore, locked by an M3x8 set screw threaded into a radial 2.6 mm hole on +X at mid-height. It also has three 4.3 mm x 6 mm Bowden tube sockets at R20 that open downward and step into 1.8 mm tendon holes. The first rolling dome, a Ø12 hub with an R7.5 cap, peaks 9 mm above the plate top.
Trunk Tower Column
Hollow riser for the 'SG90 Tendon-Driven Continuum Trunk Arm' kit. It is a 60 mm OD tube with a 2.4 mm wall and stands 70 mm tall. The Ø84 mm base flange bolts to the servo deck with 4x M3 on a 36 mm radius. The Ø76 mm top flange carries the root plate on 3x M3 at R34, with 5.7 mm hex nut pockets underneath. Three 28 mm pointed-arch windows let the Bowden tubes and wiring pass through. It prints upright with no supports.