$fn=64;

/*
 * Wet Palette and Lid Holder
 * 
 * A parametric, support-free desktop stand for a wet palette and its lid.
 * The slots are tilted backward for stability, and the back wall acts as a buttress.
 */

// --- Parameters ---
holder_width = 140;      // Total width of the stand
palette_slot = 32;       // Thickness of the main wet palette (adjust as needed)
lid_slot = 18;           // Thickness of the lid
wall = 6;                // Thickness of the walls
base = 6;                // Thickness of the base plate
front_h = 30;            // Height of the front retaining lip
mid_h = 60;              // Height of the middle divider
back_h = 90;             // Height of the back support
tilt = 12;               // Tilt angle in degrees for stability
side_border = 25;        // Width of the side brackets

// --- Calculated Values ---
depth = wall * 3 + palette_slot + lid_slot;
function tx(y) = y * tan(tilt);

// --- Geometry ---
module profile() {
    polygon([
        [0, 0],                                         // Front bottom
        [depth + tx(back_h), 0],                        // Back bottom (extended buttress)
        [depth + tx(back_h), back_h],                   // Back top outer
        [depth - wall + tx(back_h), back_h],            // Back top inner
        [depth - wall + tx(base), base],                // Back slot bottom
        [depth - wall - lid_slot + tx(base), base],     // Lid slot bottom
        [depth - wall - lid_slot + tx(mid_h), mid_h],   // Mid wall back top
        [wall + palette_slot + tx(mid_h), mid_h],       // Mid wall front top
        [wall + palette_slot + tx(base), base],         // Palette slot bottom
        [wall + tx(base), base],                        // Front slot bottom
        [wall + tx(front_h), front_h],                  // Front wall inner top
        [tx(front_h), front_h]                          // Front wall outer top
    ]);
}

difference() {
    // Main extruded body
    rotate([90, 0, 90])
        linear_extrude(height = holder_width)
            profile();

    // Center cutout to save material and improve aesthetics
    // Leaves 'side_border' on each side, and a solid lip at the bottom
    translate([side_border, -1, base + 8])
        cube([
            holder_width - side_border * 2,
            depth + tx(back_h) + 2,
            back_h + 2
        ]);
}