example.prescad

toffset = 5;
soffset = 10;
precision = 100;

module trotate() union() {
	children(1);
	rotate(a=120, v=[0, 0, 1]) children(0);
	rotate(a=240, v=[0, 0, 1]) children(0);
}

module midt() trotate() {
	intersection() {
		children(0);
		children(1);
	}
	children(0);
}

module addt() rotate(a=-103.83616, v=[0, 1, 0]) midt() {
	rotate(a=103.83616, v=[0, 1, 0]) children(0);
	children(1);
}

module srotate() union() {
	children(1);
	rotate(a=90, v=[0, 0, 1]) children(0);
	rotate(a=180, v=[0, 0, 1]) children(0);
	rotate(a=270, v=[0, 0, 1]) children(0);
}

module adds() srotate() {
	intersection() {
		children(0);
		children(1);
	}
	children(0);
}

!PRESCAD!

tcut = translate([0, 0, 500 + toffset]) cube(1000, center=true);
scut = translate([0, 0, 500 + soffset]) cube(1000, center=true);
plate = cylinder(3, 110, 110, $fn = precision, center=true);
output = union() {translate([0, 0, soffset]) plate; rotate(a=-103.83616, v=[0, 1, 0]) translate([0, 0, toffset]) plate;}
output = addt() {output; tcut;}
output = adds() {output; scut;}
output = addt() {output; tcut;}
output = difference() {sphere(r=90,$fn=precision); output;}
output;