x_size = 30; // horizontal outer size of the aquarium pedestal.y_size = 30; //thickness = 10; // thickness of the pad bellow aquarium. hairs lenght is 12mm.rim_height = 10; // height of upper rim for fixing the aquarium in position.difference () {rotate([0,0,45])cube([x_size, y_size ,thickness]);// cube([x_size - 2* thickness, y_size - 2* thickness, pedestal_height - rim_height - thickness]);}translate ([0, 0, thickness])cube([sqrt(pow(x_size,2) + pow(x_size,2))/2, sqrt(pow(x_size,2) + pow(x_size,2))/2, rim_height]);