difference(){
difference(){
    color("Magenta",0.5)

linear_extrude(height = 10, center = true, convexity = 100, twist = 0,$fn = 100)
{
   
       

translate([0,0, 0])
 square([10,10],true);

}
  color("DarkOrchid",0.5)
linear_extrude(height = 8, center = true, convexity = 100, twist = 0,$fn = 100)
{
   
       
    translate([0, 0 ,0])
   
 square([8,8],true);
}
 
}
translate([0, 3.5, 4])

linear_extrude(height = 3, center = true, convexity = 100, twist = 0,$fn = 100)
circle(r = 1);


translate([0, 1, 4])

linear_extrude(height = 3, center = true, convexity = 100, twist = 0,$fn = 100)
circle(r = 1);

translate([0, -1.5, 4])

linear_extrude(height = 3, center = true, convexity = 100, twist = 0,$fn = 100)
circle(r = 1);


x=8.4;
y=5;
translate([-2.6,5,5])
rotate(a=[0,0,270]) 
linear_extrude(height = 1, center = true, convexity = 100, twist = 0,$fn = 100)
polygon(points=[[0,0],[x,0],[x,y],[0,y],[0,y-.5],[x-.5,y-.5],[x-.5,.5],[0,.5]], paths=[[0,1,2,3,4,5,6,7,8]],convexity=10);
}