module rail() {
  import("rail-bold.stl");
}

rail_width = 20;

base_thickness = 4;
base_width = rail_width / 2;

module attachment(w = base_width) {
  cube([w, rail_width, base_thickness]);

  difference() {
    x = sqrt(pow(rail_width, 2) * 2) / 2;
    difference() {
      translate([0, rail_width / 2, rail_width / -2]) rotate([45, 0, 0]) cube([w, x, x]);
      translate([0, 0, -rail_width - (rail_width / 3)]) cube([rail_width, rail_width, rail_width]);
      translate([0, 0, base_thickness]) cube([w, rail_width, rail_width]);
    }
    translate([0, 0, -1.5]) rotate([0, 90, 0]) rail();
    translate([0, 0, -2]) cube([rail_width, 2, 2]);
    translate([0, rail_width - 2, -2]) cube([rail_width, 2, 2]);
  }
}

module holder_straight() {
  w = rail_width;
  attachment(w);

  translate([0, rail_width / 2, 10]) rotate([0, 90, 0]) cylinder(w, d = base_thickness, $fn = 200);

  hull() {
    translate([0, rail_width / 2, 10]) rotate([0, 90, 0]) cylinder(base_thickness, d = base_thickness, $fn = 200);
    translate([base_thickness / 2, 0, base_thickness / 2]) rotate([-90, 0, 0]) cylinder(rail_width, d = base_thickness, $fn = 200);
  }

  hull() {
    #translate([w - base_thickness, rail_width / 2, 10]) rotate([0, 90, 0]) cylinder(base_thickness, d = base_thickness, $fn = 200);
    translate([w - base_thickness / 2, 0, base_thickness / 2]) rotate([-90, 0, 0]) cylinder(rail_width, d = base_thickness, $fn = 200);
  }
}

module holder_angled() {
  attachment();

  translate([base_width / 2, 0, 10]) rotate([-90, 0, 0]) cylinder(rail_width, d = base_thickness, $fn = 200);

  hull() {
    translate([base_width / 2, 0, 10]) rotate([-90, 0, 0]) cylinder(base_thickness, d = base_thickness, $fn = 200);
    translate([0, base_thickness / 2, base_thickness / 2]) rotate([0, 90, 0]) cylinder(base_width, d = base_thickness, $fn = 200);
  }

  hull() {
    translate([base_width / 2, rail_width - base_thickness, 10]) rotate([-90, 0, 0]) cylinder(base_thickness, d = base_thickness, $fn = 200);
    translate([0, rail_width - base_thickness / 2, base_thickness / 2]) rotate([0, 90, 0]) cylinder(base_width, d = base_thickness, $fn = 200);
  }
}

holder_angled();

translate([rail_width, 0, 0]) holder_straight();