PP Ashtray thingiverse: http://www.thingiverse.com/thing:121190 ashtray designed by Pio Porcinai, 3d modeled in openscad the STL needs to be scaled, the original size is 12x12x2.5cm

pp_ashtray.scad

//$fs = 0.3;
$fn = 50;

// main
difference() {
  ashtray();
  decoration();
}

module ashtray() {
  scale([4, 4, 4]) intersection() {
    // intersection quarter
    cube([60, 60, 20]);
    cube([30, 30, 20]);

    difference(){
      piece();
     # translate([6.2, 6.2]) cylinder(4.5, 5, 5); // ashtray
    }
  }
}

module decoration() {
  difference() {
    cylinder(4.5, 97, 97);
    cylinder(4.5, 85, 85);
  }
}

module piece() {
  cylinder(2.3, 30, 30); // handle
  cylinder(6, 15, 15); // base
  translate([15, 15]) cylinder(6, 3.5, 3.5); // foot
}