$fn=64;

// --- Parameters ---
num_slots = 5;          // Number of cable slots
spacing = 15;           // Distance between slots
cable_dia = 6;          // Diameter of the cable resting hole
slot_opening = 3.5;     // Width of the channel to snap the cable in
depth = 25;             // Front-to-back depth of the holder
height = 15;            // Overall height of the holder
padding = 12;           // Space on the left and right ends
corner_radius = 4;      // Radius of the rounded corners

// Calculated total length
length = (num_slots - 1) * spacing + (2 * padding);

difference() {
    // Main body
    hull() {
        translate([corner_radius, corner_radius, 0]) 
            cylinder(r=corner_radius, h=height);
            
        translate([length - corner_radius, corner_radius, 0]) 
            cylinder(r=corner_radius, h=height);
            
        translate([corner_radius, depth - corner_radius, 0]) 
            cylinder(r=corner_radius, h=height);
            
        translate([length - corner_radius, depth - corner_radius, 0]) 
            cylinder(r=corner_radius, h=height);
    }

    // Cutouts for cables
    for (i = [0 : num_slots - 1]) {
        x_pos = padding + (i * spacing);
        
        // Main circular resting hole for the cable
        translate([x_pos, -1, height - 7]) 
            rotate([-90, 0, 0]) 
            cylinder(d=cable_dia, h=depth + 2);
            
        // Vertical channel to snap the cable into place
        translate([x_pos - (slot_opening / 2), -1, height - 7]) 
            cube([slot_opening, depth + 2, 8]);
            
        // Flared opening at the top for easier cable insertion
        translate([x_pos, -1, height]) 
            rotate([-90, 0, 0]) 
            cylinder(d=slot_opening + 4, h=depth + 2);
    }
}