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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.
Venturi Vacuum Gripper Head
A pick-and-place vacuum head that bolts straight to an MGN12H carriage (20 x 20 mm M3 pattern) and clamps a 4 mm OD PTFE/Bowden vacuum line in a split barrel pinched by a single M3 bolt with a captured nut. A Ø10.5 mm counterbore at the bottom seats a suction-cup collar, and a Ø22 mm scallop with two 4.5 mm zip-tie slots cradles the venturi ejector body alongside. Overall 52.5 x 29 x 52 mm.