Foldable Ergonomic Laptop Stand

Create a parametric 3D solid model of a foldable, angle-adjustable ergonomic laptop stand in STEP format. Sketch & Base Extrusion: - Create two symmetric side truss legs (left and right), separated by a 230mm internal width. - Base footprint per side leg: 240mm total depth, with a max deployed height of 210mm. - Main structural profile: Solid 20mm width extrusion with triangular internal pocket cutouts (truss geometry) leaving a minimum wall thickness of 3.2mm. Retaining Lip & Support Surface: - Laptop support platform length: 210mm, angled upward. - Front retaining hook: Extrude a curved lip upward by 25mm with an internal fillet radius of 15mm to hold a 18mm thick laptop body. Folding Mechanism & Hinge: - At the rear base junction of each side leg, create a circular hinge boss (outer diameter 16mm) with a centered 3.15mm hole for a 3mm metal pivot pin. - Add a 1.5mm clearance offset on mating surfaces to allow the support arm to rotate and fold completely flat against the base frame to a maximum folded height of 35mm. Angle Adjustment Mechanism: - On each side leg, sketch an arc slot with a center radius of 110mm from the pivot. - Create 4 discrete locking pin holes along the arc at angular intervals corresponding to 18 degrees, 25 degrees, 32 degrees, and 40 degrees. - Hole diameters: 3.15mm with a 0.2mm tolerance fit. Cross-Bracing & Cable Clips: - Connect the two side legs at the base using a horizontal cross-strut (250mm overall width, 15mm profile height). - On the front cross-strut, feature a 15mm deep recessed slot for phone placement. - Cut a 3.5mm U-shaped cable channel along the outer rear edge of each side leg for friction-fit wire routing. Fillets & Operations: - Apply a 35mm fillet (R35) on primary exterior frame joints for stress distribution. - Apply a 2mm fillet (R2) on all sharp outer edges for ergonomic hand clearance. - Output as a manifold B-Rep solid body (STEP format).

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