wh = 0.6
b = [80,55,2]
top = 15
bot = 5
eps = 0.001

/*
module base()
{
    translate([0,0,b.z / 2])
    cube(b, center=true);
}
*/

base= cube([80,55,2],center=true)
base= translate(base,[0,0,2/2])

/*
module bar()
{
    translate([0,(bot - top) / 2, wh / 2 - eps])
    
    cube([b.x + 1, b.y - bot - top + 1, wh], center=true);
}
*/

bar=cube([80+1,55-5-15+1,0.6],center=true)
bar=translate(bar,[0,(bot-top)/2,wh/2-eps])

/*
color("white")
intersection()
{
    base();
    bar();
}

color("red")
difference()
{
    base();
    bar();
}
*/
www = intersect([base,bar])
rrr = difference([base,bar])
rrr.color=red
www.color=white

show_viewer([rrr,www])
show_ply([www,rrr])
show_scad([www,rrr])