$fn = 64;

// Parameters
height = 100;
outer_radius = 40;
wall_thickness = 2;
base_thickness = 2;
divider_thickness = 2;

union() {
    // Main cylindrical cup
    difference() {
        cylinder(h = height, r = outer_radius);
        
        // Inner cutout
        translate([0, 0, base_thickness])
            cylinder(h = height, r = outer_radius - wall_thickness);
    }

    // Interior divisions (cross shape)
    intersection() {
        // Embed dividers halfway into the wall for a manifold union
        translate([0, 0, base_thickness])
            cylinder(h = height - base_thickness, r = outer_radius - (wall_thickness / 2));
        
        union() {
            // X-axis divider
            translate([-outer_radius, -divider_thickness / 2, base_thickness])
                cube([outer_radius * 2, divider_thickness, height - base_thickness]);
            
            // Y-axis divider
            translate([-divider_thickness / 2, -outer_radius, base_thickness])
                cube([divider_thickness, outer_radius * 2, height - base_thickness]);
        }
    }
}