gear mechanism 3d model

Create a 3D‑printable PLA herringbone‑gear phone stand with servo tilt. Phone size: 168×80×16 mm. Make a cradle: 175×86×3.5 mm plate, 175×2×10 mm side rails, 82 mm inner width, 12×86×3.5 mm bottom ledge, two 30×4 mm strap slots 40 mm from top/bottom. Add a large herringbone gear: 80 mm diameter, 10 mm thick, 8 mm bore. Add a pivot arm frame: two arms 70×4×20 mm spaced 90 mm apart, with 3 mm hinge holes 10 mm below top. Add a servo mount for EMAX ES08MAII: pocket 23.6×12×24.5 mm inside a 30×20×30 mm block, two 20×8×2 mm tabs with 2 mm holes. Add a 12 mm diameter, 10 mm thick herringbone pinion on the servo horn. Add linkage: 18×3×3 mm bar with 2 mm and 3 mm holes. Assemble: pinion drives big gear, cradle attaches to gear, tilt ±30°. Output separate parts + assembled + exploded view.