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== Modules==

Modules are callable procedures.  We will define 2 of them:
* The first makes a single cone and places it at the origin of the coordinate system [0,0,0]
* the second calls the first nb times, making cones and ''translating'' (moving) them along the x-axis.

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// this makes a single cone of 'height' tall,
// at [0,0,0]
module cone(height){
  cylinder(h=height,
           r1=r_lower,
           r2=r_upper,
           $fn=definition);   // the 'smoothness'
}

// this makes 'nb' cones,
// each is taller than the previous,
// while shifting them along the x-axis
// note:this code will not make proper STL, because of 'holes' between the cones

module make_cones(nb){
  for (i= [0:nb-1]){
    translate([cone_step*i,0,0])
      cone(cone_height+(cone_h_step*i));
  }
}
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