hollow cube frame 3d model

// Smartwatch basic casing length = 55; width = 40; height = 14; wall = 2; difference() { // outer box cube([length, width, height], center=true); // inner hollow translate([0,0,wall]) cube([length-2*wall, width-2*wall, height], center=true); // screen cutout translate([0,0,height/2]) cube([35, 20, 5], center=true); }