$fn = 64;

// --- Parameters ---
holder_length = 75;      // Overall length (Standard business card is ~89mm)
base_width = 25;         // Width at the bottom for stability
top_width = 10;          // Width at the top
holder_height = 15;      // Total height of the holder
slot_thickness = 1.2;    // Thickness of the vertical slot
slot_depth = 8;          // Insertion depth for the card
corner_radius = 1.5;     // Radius for rounded outer edges

// 2D Profile of the holder base
module profile() {
    hull() {
        translate([-base_width/2 + corner_radius, corner_radius])
            circle(r=corner_radius);
        translate([base_width/2 - corner_radius, corner_radius])
            circle(r=corner_radius);
        translate([-top_width/2 + corner_radius, holder_height - corner_radius])
            circle(r=corner_radius);
        translate([top_width/2 - corner_radius, holder_height - corner_radius])
            circle(r=corner_radius);
    }
}

// 3D Geometry
difference() {
    // Main Stand Body
    rotate([90, 0, 90])
        linear_extrude(height = holder_length, center = true)
        profile();

    // Vertical Card Slot
    translate([0, 0, holder_height - slot_depth/2 + 1])
        cube([holder_length + 2, slot_thickness, slot_depth + 2], center = true);

    // Chamfered Slot Entrance for easy insertion
    translate([0, 0, holder_height])
        rotate([45, 0, 0])
        cube([holder_length + 2, slot_thickness * 1.5, slot_thickness * 1.5], center = true);
}