adjustable laptop stand 3d model

Design a freestanding supine laptop stand for a bedridden user lying completely flat on a bed. The stand has two vertical telescoping square aluminum tubes (28mm cross-section, height adjustable from 400mm to 600mm) connected at the top by a horizontal crossbar (500mm span). Each vertical leg terminates in an L-shaped horizontal foot (200mm long) that slides flat under the mattress edge for stability. From the center of the crossbar, a two-segment articulating arm extends 250mm horizontally then 150mm downward at a 30-degree angle, connected by two friction-lock pivot joints with thumb-wheel tighteners. The arm ends in a rectangular laptop tray (320mm x 220mm x 5mm thick) angled at 30 degrees from vertical, with a 15mm raised lip on the bottom edge as a wrist rest. A USB hub housing (60mm x 30mm x 15mm) is clipped to the top crossbar. All joints are cylindrical with 8mm bolt-through friction locks. Material is 6061 aluminum tube with black anodized finish. Include cable management clips spaced every 80mm alon