$fn = 64;

// --- Parameters ---

// Total length of this divider piece (mm)
length = 200;

// Height of the divider (mm)
height = 50;

// Thickness of the divider material (mm)
thickness = 2.0;

// Number of interlocking slots (defines compartment count)
num_slots = 4;

// Tolerance for interlocking fit (mm) - increase if fit is too tight
tolerance = 0.4;

// --- Module ---

module divider_strip(l, h, t, slots, tol) {
    slot_w = t + tol;
    spacing = l / (slots + 1);

    difference() {
        // Main divider body (laid flat for optimal 3D printing)
        cube([l, h, t]);

        if (slots > 0) {
            for (i = [1 : slots]) {
                // Interlocking slot cutout (cuts halfway through the height)
                translate([i * spacing - slot_w/2, h/2, -0.1])
                    cube([slot_w, h/2 + 0.2, t + 0.2]);

                // V-shaped chamfer at slot entry for easier assembly
                translate([i * spacing - slot_w/2, h - 2, -0.1])
                    linear_extrude(t + 0.2)
                        polygon([
                            [-2, 2.2],          // Top left (wider)
                            [slot_w + 2, 2.2],  // Top right (wider)
                            [slot_w, 0],        // Bottom right (slot width)
                            [0, 0]              // Bottom left (slot width)
                        ]);
            }
        }
    }
}

// --- Output ---

// Generate one divider piece.
// Print multiple pieces and flip half of them upside down to create an interlocking grid.
divider_strip(length, height, thickness, num_slots, tolerance);