title: How to modify imported .stl files in OpenSCAD?
body: <p>Is there anyway to go about importing STL files into OpenSCAD with the ability to modify them?</p>
  
  <p>For instance, the following code demonstrates what I have tried thus far:</p>
  
  <pre><code>difference() {
      import("spherical_puzzle_base.stl");
      translate([0, 0, -RADIUS/2]) {
          cube([RADIUS*2, RADIUS*2, RADIUS], center=true);
      }
  }
  </code></pre>
  
  <p>When I do this I can either hit F5 to render the STL file only which doesn't include the intersection. Or I can hit F6 to compile and render, but it creates a very messed up rendering, no where near manifold or even close to what I would expect for that matter. Is there a solution to this problem using OpenSCAD? Thanks!</p>
  
  <p>(I am attempting to do it this way to save long rendering times, especially while I am testing various design possibilities)</p>