$fn=120;
side=30;
material=2;
kerf=0.05;
thickness=material-2*kerf;

// Connector Piece.
difference()
{
square(side,true);
    square([side,thickness],true);
    square([thickness,side],true);
    translate([side/2,side/2,0])square(side/2,true);
    //this is the upper rotated sqaure
    translate([0,15,0])rotate(45) square(5,true);
    //this is the down left square
    translate([side/-2,side/-2,0])square(side/2,true);
    translate([0,-15,0])rotate(45) square(5,true);
    //this is the down right square
    translate([side/2,side/-2,0])square(side/2,true);
    //this is the right rotated square
    translate([15,0,0])rotate(45) square(5,true);
    //this is the upper left suare
    translate([side/-2,side/2,0])square(side/2,true);
    //left rotated square
    translate([-15,0,0])rotate(45) square(5,true);
      
}

square(side/2,true);

// Connector Piece.


//Crescent Piece.
translate([side,0,0])
intersection()
{
    square(side);
    difference()
    {
        translate([side,side,0])circle(side);
        translate([side,side,0])circle(side/1.4);
       //Upper Notch
        translate([2,30,0])square(thickness,true);
        translate([2,29,0])square(thickness,true);
        translate([2,28,0])square(thickness,true);
    
     //Lower Notch   
        translate([30,2,0])square(thickness,true);
         translate([29,2,0])square(thickness,true);
         translate([28,2,0])square(thickness,true);
    }
}
//Crescent Piece 2
translate([side,25,0])
intersection()
{
    square(side);
    difference()
    {
        translate([side,side,0])circle(side);
        translate([side,side,0])circle(side/1.4);
       //Upper Notch
        translate([4,30,0])square(thickness,true);
        translate([4,29,0])square(thickness,true);
        translate([4,28,0])square(thickness,true);
    
     //Lower Notch   
        translate([30,4,0])square(thickness,true);
         translate([29,4,0])square(thickness,true);
         translate([28,4,0])square(thickness,true);
        
    }
}
//Elipse Piece
translate([side,70,0])
difference()
{
    
    scale([1.5,.5])circle(d=40);
    //Left Square
    translate([-30,0,0])square(thickness,true);
    translate([-29,0,0])square(thickness,true);
    translate([-28,0,0])square(thickness,true);
    translate([-27,0,0])square(thickness,true);
    translate([-26,0,0])square(thickness,true);
    //Top Square
    translate([0,10,0])square(thickness,true);
    translate([0,9,0])square(thickness,true);
    translate([0,8,0])square(thickness,true);
    translate([0,7,0])square(thickness,true);
    translate([0,6,0])square(thickness,true);
    //Right Square
    translate([0,-10,0])square(thickness,true);
    translate([0,-9,0])square(thickness,true);
    translate([0,-8,0])square(thickness,true);
    translate([0,-7,0])square(thickness,true);
    translate([0,-6,0])square(thickness,true);
    //Lower Square
    translate([30,0,0])square(thickness,true);
    translate([29,0,0])square(thickness,true);
    translate([28,0,0])square(thickness,true);
    translate([27,0,0])square(thickness,true);
    translate([26,0,0])square(thickness,true);
    }