[fiddlecad] Modern Ladder-Back Chair

model.scad

// Parametric modern dining chair
$fn = 48;
seat_w = 48; seat_d = 46; seat_h = 45; seat_t = 4;
leg = 4.2; back_h = 42; back_t = 3.2;

module rounded_box(size=[10,10,10], r=2) {
  hull() {
    for (x=[r,size[0]-r], y=[r,size[1]-r])
      translate([x,y,r]) sphere(r=r);
    for (x=[r,size[0]-r], y=[r,size[1]-r])
      translate([x,y,size[2]-r]) sphere(r=r);
  }
}

module tapered_leg(x,y,lean_x=0,lean_y=0) {
  hull() {
    translate([x,y,1.5]) cube([leg-1.2,leg-1.2,3],center=true);
    translate([x+lean_x,y+lean_y,seat_h-seat_t/2])
      cube([leg,leg,3],center=true);
  }
}

module chair() {
  tapered_leg(-seat_w/2+5,-seat_d/2+5, 1.8, 1.8);
  tapered_leg( seat_w/2-5,-seat_d/2+5,-1.8, 1.8);
  tapered_leg(-seat_w/2+5, seat_d/2-5, 1.8,-1.8);
  tapered_leg( seat_w/2-5, seat_d/2-5,-1.8,-1.8);

  translate([0,-seat_d/2+5,seat_h-5]) cube([seat_w-10,3,5],center=true);
  translate([0, seat_d/2-5,seat_h-5]) cube([seat_w-10,3,5],center=true);
  translate([-seat_w/2+5,0,seat_h-5]) cube([3,seat_d-10,5],center=true);
  translate([ seat_w/2-5,0,seat_h-5]) cube([3,seat_d-10,5],center=true);

  translate([-seat_w/2,-seat_d/2,seat_h-seat_t])
    rounded_box([seat_w,seat_d,seat_t],2.2);

  for (x=[-seat_w/2+5,seat_w/2-5])
    hull() {
      translate([x,seat_d/2-4,seat_h-1]) cube([leg,back_t,4],center=true);
      translate([x,seat_d/2+3,seat_h+back_h]) cube([leg,back_t,5],center=true);
    }

  for (z=[seat_h+13,seat_h+24,seat_h+35])
    hull() {
      translate([-seat_w/2+5,seat_d/2+(z-seat_h)*0.16,z]) sphere(r=2.2);
      translate([ seat_w/2-5,seat_d/2+(z-seat_h)*0.16,z]) sphere(r=2.2);
      translate([0,seat_d/2+(z-seat_h)*0.16-1.5,z+1])
        cube([seat_w-12,back_t,5],center=true);
    }

  hull() {
    translate([-seat_w/2+5,seat_d/2+7,seat_h+back_h]) sphere(r=2.7);
    translate([ seat_w/2-5,seat_d/2+7,seat_h+back_h]) sphere(r=2.7);
    translate([0,seat_d/2+5.5,seat_h+back_h+1])
      cube([seat_w-11,back_t,5],center=true);
  }
}

// FiddleCAD uses Y as the vertical axis.
rotate([-90,0,0]) chair();

model.stl

screenshot.png