$fn = 64;

// --- PARAMETERS ---
plate_length = 160;
plate_width = 45;
plate_thickness = 6;
corner_radius = 5;

hook_spacing = 50;
hook_base_r = 7;
hook_tip_r = 5;
hook_z_ext = 15;     // Straight outward extension from plate
hook_y_up = 25;      // Upward curve distance
hook_z_up = 25;      // Outward angle for support-free 45-deg printing
hook_y_offset = -5;  // Shift hooks down slightly for visual balance

hole_dist = 68;      // Distance from center for mounting holes
hole_d1 = 4.5;       // Screw shaft diameter (M4 clearance)
hole_d2 = 9.0;       // Screw head diameter

// --- MODULES ---

module rounded_plate() {
    hull() {
        for(x = [-plate_length/2 + corner_radius, plate_length/2 - corner_radius]) {
            for(y = [-plate_width/2 + corner_radius, plate_width/2 - corner_radius]) {
                translate([x, y, 0]) 
                    cylinder(r=corner_radius, h=plate_thickness);
            }
        }
    }
}

module screw_hole() {
    // Screw shaft clearance
    translate([0, 0, -1]) 
        cylinder(d=hole_d1, h=plate_thickness + 2);
    
    // Countersink for screw head
    translate([0, 0, plate_thickness - (hole_d2 - hole_d1)/2]) 
        cylinder(d1=hole_d1, d2=hole_d2, h=(hole_d2 - hole_d1)/2 + 0.1);
    
    // Top clearance
    translate([0, 0, plate_thickness]) 
        cylinder(d=hole_d2, h=10);
}

module single_hook() {
    // Main outward pillar
    hull() {
        cylinder(r=hook_base_r, h=plate_thickness);
        translate([0, 0, hook_z_ext]) 
            sphere(r=hook_base_r);
    }
    
    // Angled upward hook (45 degrees ensures no supports needed)
    hull() {
        translate([0, 0, hook_z_ext]) 
            sphere(r=hook_base_r);
        translate([0, hook_y_up, hook_z_ext + hook_z_up]) 
            sphere(r=hook_tip_r);
    }
}

// --- MAIN ASSEMBLY ---

difference() {
    union() {
        // Base plate
        rounded_plate();
        
        // 3 Matching Hooks
        for(x = [-hook_spacing, 0, hook_spacing]) {
            translate([x, hook_y_offset, 0]) 
                single_hook();
        }
    }
    
    // Mounting holes
    translate([-hole_dist, 0, 0]) screw_hole();
    translate([hole_dist, 0, 0]) screw_hole();
}