union() {
//variables
thicknes=8.5;
material=1.1;
leg_length=12;

//middle part
translate([-material/2, 0 ,0])
    cube([material, 28.5, thicknes]);

    //bottom
    color("Blue"){
        translate([-2.1, 0, 0])
            cube([2.5*material+3, material, thicknes]);
    } 
     //top
    color("Blue"){
        translate([0, 27.4, 0])
            cube([2+material/2, material, thicknes]);
    }
    
    
    //right lower part
    color("Green"){
        translate([2+material/2, 0, 0])
            cube([material, 12, thicknes]);
    }
    
   //right upper part
    color("Green"){
        translate([2+material/2, 28.5-leg_length, 0])
            cube([material, leg_length, thicknes]);
    }
    

 /**** left part ****/
  difference() {
      // assemble left part
      union() {
        // lower left part
        color("Green"){
            translate([-2,0,0])
            rotate(6.2)
                cube([material, leg_length, thicknes]);
       }
       
        //middle left part - outside
       r_outer=3.6/2;
        color("Blue"){
            translate([-2.75, 14.25, 0])
                cylinder(thicknes, r_outer, r_outer, $fn=50);
        }

         // middle part
        color("Blue"){
            translate([-3.3, 11.75, 0])
                cube([material, 5, thicknes]);
            }
            
        // upper left part
        color("Green"){
            translate([-3.3,16.7,0])
            rotate(-6.2)
                    cube([material, 3, thicknes]);
       }      
    }
 
    // clear the middle of the left part
    r_delete=3.4/2;
      translate([-2.0, 14.25, 0])
        cylinder(8.5, r_delete, r_delete, $fn=50);
  }
  
  // fill lower left
  color("Red"){
      translate([-material*1.8, 0, 0])
      cube([material*1.8, 10, thicknes]);
  }
  }