Some OpenSCAD examples

test1.scad

translate([-375,-375,-250])
{
  cube([750,750,25]);
  translate([0,0,525])
  cube([750,750,25]);
  translate([0,0,240])
  cube([750,750,25]);
  …

test2.scad

module tvstand(width, height, depth, thickness)
{
	backthickness = 5;
	backcolor = [.4,.3,.2];
	hole=height/8;
	translate([-width/2,-depth/2,-height/2])
	{
		cube([width,depth,thickness]);
		translate([0,0,height-thickness])
		cube([width,depth,thickness]);
		translate([0,0,thickness])
		cube([thickness,depth,height-(thickness*2)]);
		translate([width-thickness,0,thickness])
		cube([thickness,depth,height-(thickness*2)]);
		translate([thickness,0,(height-(thickness*2))/2])
		cube([width-(thickness*2),depth,thickness]);
		difference()
		{
			translate([0,depth,0])
			color(backcolor)
			cube([width,backthickness,height]); 
			translate([width/2,depth+hole/2,height/4])
			rotate([90,0,0])
			cylinder(hole,hole,hole);
			translate([width/2,depth+hole/2,height-height/4])
			rotate([90,0,0])
			cylinder(hole,hole,hole);
		}
	}
}
tvstand(750,525,750,25);