$fn=64;

// --- Parameters ---
pot_size_inches = 4;
pot_id = pot_size_inches * 25.4 + 2; // ~103.6mm (includes 2mm clearance)
ring_wall = 4;
ring_height = 12;

arm_length = 25;
arm_width = 16;
arm_height = 12;

twist_shaft_dia = 14;
twist_shaft_len = 6;
twist_tab_len = 24;
twist_tab_width = 8;
twist_tab_thick = 3;

// --- Geometry ---
union() {
    // Main Pot Ring
    difference() {
        cylinder(h=ring_height, d=pot_id + ring_wall*2);
        translate([0, 0, -1])
            cylinder(h=ring_height + 2, d=pot_id);
    }

    // Connecting Arm (Overlaps ring by 2mm for manifoldness)
    translate([(pot_id/2) - 2, -arm_width/2, 0])
        cube([arm_length + 2, arm_width, arm_height]);

    // Twist-Lock Connector (Overlaps arm by 1mm for manifoldness)
    translate([(pot_id/2) + arm_length - 1, 0, arm_height/2]) {
        rotate([0, 90, 0]) {
            // Shaft
            cylinder(h=twist_shaft_len + twist_tab_thick + 1, d=twist_shaft_dia);

            // Locking Tab
            translate([0, 0, twist_shaft_len + 1])
                translate([-twist_tab_width/2, -twist_tab_len/2, 0])
                cube([twist_tab_width, twist_tab_len, twist_tab_thick]);
        }
    }
}