$fn = 64;

// --- Parameters ---
tube_length = 160.0;     // Length of the sliding tube (determines max bag width)
rod_dia = 5.0;           // Diameter of the inner rod
tube_od = 12.0;          // Outer diameter of the sliding tube
tube_id = 6.5;           // Inner diameter of the sliding tube (rod + bag clearance)
slit_width = 1.5;        // Width of the slit for the bag
handle_len = 15.0;       // Length of the grip handle
handle_width = 16.0;     // Width of the grip handle
transition_len = 12.0;   // Length of the taper from handle to rod

module inner_rod() {
    union() {
        // Grip handle
        translate([0, -handle_width/2, 0])
            cube([handle_len + 0.1, handle_width, rod_dia]);

        // Tapered transition
        hull() {
            translate([handle_len, -handle_width/2, 0])
                cube([0.1, handle_width, rod_dia]);
            translate([handle_len + transition_len, 0, rod_dia/2])
                rotate([0, 90, 0])
                cylinder(d=rod_dia, h=0.1);
        }

        // Main rod
        translate([handle_len + transition_len - 0.1, 0, rod_dia/2])
            rotate([0, 90, 0])
            cylinder(d=rod_dia, h=tube_length + 0.1);

        // Rounded tip
        translate([handle_len + transition_len + tube_length, 0, rod_dia/2])
            sphere(d=rod_dia);
    }
}

module outer_tube_profile() {
    difference() {
        // Main body
        difference() {
            circle(d=tube_od);
            // Cut right side to make a flat bottom for 3D printing
            translate([tube_od/2 - 1, -tube_od])
                square([tube_od, tube_od * 2]);
        }
        // Inner hole
        circle(d=tube_id);
        // Slit (on left side, pointing UP when printed)
        translate([-tube_od, -slit_width/2])
            square([tube_od + 0.1, slit_width]);
    }
}

module outer_tube() {
    // Position it next to the inner rod, flat on the print bed
    translate([0, tube_od + 10, tube_od/2 - 1])
    rotate([0, 90, 0])
    difference() {
        linear_extrude(height=tube_length)
            outer_tube_profile();

        // Flare the inner hole at the entry to guide the rod and lock onto taper
        translate([0, 0, -0.1])
            cylinder(d1=tube_od - 2, d2=tube_id, h=15.2);

        // Flare the slit at the entry to easily catch the bag
        hull() {
            translate([-tube_od, -tube_id/2, -0.1])
                cube([tube_od, tube_id, 0.1]);
            translate([-tube_od, -slit_width/2, 15])
                cube([tube_od, slit_width, 0.1]);
        }
    }
}

// Render both parts side-by-side
inner_rod();
outer_tube();