headphones 3d model

Create a manufacturable, parametric over-ear headphone CAD model (STEP) with strict symmetry, smooth fillets, and ergonomic proportions. Headband: 25 mm thick curved arc following head contour. Outer shell in matte polycarbonate, inner breathable mesh padding. Inside, include continuous hollow airflow ducts (Ø6–8 mm) from both sides converging at center. Integrate a fully enclosed 30 mm axial fan at the top center; no external exposure. Add a subtle circular exhaust grille (Ø1 mm perforations) on top surface. Airflow: intake → ear cup vents → around ear cavity → vertical channels → headband ducts → fan → top exhaust. Maintain sealed, continuous path. Ear cups: oval, ~100 mm height, 80 mm width, 40 mm depth. Three layers: soft memory foam cushion, rigid support ring, smooth outer shell. Add discreet intake vents (micro-perforations or mesh slots) on lower rear area, aligned to internal channels. Arms: adjustable telescopic sliders with detents; hinges allow ~90° rotation and ±15° tilt.