render_box=true;
render_divider=false;
render_lid=false;

mtg_deck_height = 3 * 25.4; // 3", sleeved, card + paper proxy
hollow_w = 95; // cards are 92 in sleeves
hollow_h = 70; // cards are 62 in sleeves

n_decks = 3;
wall_thickness = 5;
divider_depth = 2;
divider_epsilon = 1;

module divider() {
   cube([hollow_w + 2*divider_epsilon, divider_depth, hollow_h+wall_thickness]);
}

module magnet() {
   cylinder(h=1, d=3, $fn=100);
}

module box_magnets() {
  translate([outer_w-3,3,outer_h-1+0.0001]) {
     #magnet();
  }
  translate([outer_w-3,outer_d-3,outer_h-1+0.0001]) {
     #magnet();
  }
  translate([3,3,outer_h-1+0.0001]) {
     #magnet();
  }
  translate([3,outer_d-3,outer_h-1+0.0001]) {
     #magnet();
  }  
}
internal_space_w = hollow_w;
internal_space_depth = mtg_deck_height * n_decks;
if (n_decks > 1) {
    internal_space_depth = internal_space_depth + divider_depth * (n_decks-1);
}
internal_space_height = hollow_h;

outer_w = internal_space_w + 2*wall_thickness;
outer_d = internal_space_depth + 2*wall_thickness;
outer_h = internal_space_height + 2*wall_thickness;

dividers = n_decks - 1;

module box() {
difference() {
  cube([outer_w, outer_d, outer_h]);
  translate([wall_thickness, wall_thickness, wall_thickness]) {
    cube([internal_space_w, internal_space_depth, internal_space_height+wall_thickness+.01]);
  };
  for(div_n = [1 : dividers]) {
    translate([wall_thickness - divider_epsilon, wall_thickness +div_n*mtg_deck_height + divider_depth/2, wall_thickness]) {
      #divider();
    };
  }
  box_magnets();
};
}

module lid() {
  difference() {
    cube([outer_w, outer_d, wall_thickness]);  
    translate([0, 0, -outer_h+wall_thickness]) {
      box_magnets();
    };
  }
}

if (render_box) {
  box();
}

if (render_lid) {
  lid();
}

if (render_divider) {
  divider();
}