// Pipe Fitting Generator

/* [General Settings] */
// Choose fitting type
Fitting_Type = "Coupler"; // [Coupler, Tee, Cross]

// Choose measurement system
Measurement_System = "Metric"; // [Metric, SAE]

// Pipe outer diameter (mm for Metric, inches for SAE)
Pipe_OD = 40; // [10:1:200]

// Wall thickness (mm for Metric, inches for SAE)
Wall_Thickness = 3; // [1:0.5:10]

// Threaded or non-threaded
Threaded = false; // [true, false]

/* [Thread Settings] */
// Thread pitch (mm for Metric, threads per inch for SAE)
Thread_Pitch = 3; // [0.5:0.25:5]

// Thread depth (mm for Metric, inches for SAE)
Thread_Depth = 1; // [0.5:0.25:3]

/* [Hidden] */
$fn = 100;

module pipe_segment(length) {
    difference() {
        cylinder(h=length, d=Pipe_OD + 2*Wall_Thickness);
        translate([0, 0, -0.1])
            cylinder(h=length + 0.2, d=Pipe_OD - 2*Wall_Thickness);
    }
}

module thread(length) {
    pitch = (Measurement_System == "Metric") ? Thread_Pitch : 25.4 / Thread_Pitch;
    depth = (Measurement_System == "Metric") ? Thread_Depth : Thread_Depth * 25.4;
    
    difference() {
        cylinder(h=length, d=Pipe_OD + 2*Wall_Thickness);
        translate([0, 0, -0.1])
            cylinder(h=length + 0.2, d=Pipe_OD - 2*Wall_Thickness);
        if (Threaded) {
            for (i = [0:pitch:length]) {
                translate([0, 0, i])
                    rotate_extrude()
                        translate([Pipe_OD/2 + Wall_Thickness - depth/2, 0, 0])
                            circle(d=depth);
            }
        }
    }
}

module coupler() {
    length = Pipe_OD + 2*Wall_Thickness;
    thread(length);
}

module tee() {
    length = Pipe_OD + 2*Wall_Thickness;
    branch_length = (Pipe_OD + 2*Wall_Thickness) / 2;
    
    difference() {
        union() {
            thread(length);
        rotate([0, 90, 0])
            translate([0, 0, 2*-branch_length])
                thread(4*branch_length);
        }
        // Main pipe hole
        translate([0, 0, -length/ - 0.1])
            cylinder(h=length + 0.2, d=Pipe_OD - 2*Wall_Thickness);
        // Branch hole
        rotate([0, 90, 0])
            translate([0, 0, -branch_length - 0.1])
                cylinder(h=2*branch_length + 0.2, d=Pipe_OD - 2*Wall_Thickness);
    }
}

module cross() {
    length = Pipe_OD + 2*Wall_Thickness;
    
    difference() {
        union() {
            // + X-axis branches
            rotate([0, 90, 0])
                thread(length);
            // + Z-axis branches
            thread(length);
            //  - X-axis branches
            rotate([0, -90, 0])
                thread(length);
            rotate([0, 180, 0])
            // - Z-axis branches
                thread(length);
        }
        // X-axis hole
        rotate([0, 90, 0])
            translate([0, 0, -length/2 - 0.1])
                cylinder(h=length + 0.2, d=Pipe_OD - 2*Wall_Thickness);
        // Z-axis hole
        translate([0, 0, -length/2 - 0.1])
            cylinder(h=length + 0.2, d=Pipe_OD - 2*Wall_Thickness);
    }
}


if (Fitting_Type == "Coupler") {
    coupler();
} else if (Fitting_Type == "Tee") {
    tee();
} else if (Fitting_Type == "Cross") {
    cross();
}