So I created a function that creates a hollow cube by differencing two
cubes.  For some reason though it wont compile.  I keep getting a syntax
error on the first bracket  after the difference function is called.  If I
comment out the difference function it works fine.  What am I missing here?
You can use the difference function in a  user defined function right? If
not how can I create a function to create an object?

function CreateNonArchedBody(boxLength,
boxWidth,
boxHeight,
boxDepth,
boxWallThickness,
boxHingeDiameter,
boxHingePinDiameter,
boxHingeXOffset,
boxHingeYOffset,
boxHingeTolerance,
pinTolerance,
controlArmPinDiameter,
controlArmHoleXOffset,
controlArmHoleYOffset) =

    difference() {
        cube([boxLength,boxWidth,boxHeight], 
             center = true
            );
        translate([0,0,((boxHeight-boxDepth)/2)]) 
            cube([boxLength - boxWallThickness, 
                  boxWidth - boxWallThickness, 
                  boxDepth], 
                  center = true
            );
    }

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This should be a module rather than a function. Just change the keyword and
drop the "="

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Oh Thanks that works.  What is the difference between the two?  What
determines when you use a function vs a module?

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I learned it this way:

a = x;  // x is a parameter, previously defined as x=something;
b = x( ); // x is a function
x; // x is a module

So in OpenScad you can have same name x representing 3 different things.

$  Runsun Pan, PhD

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$ -- Linux Mint 17.1 Rebecca x64  + OpenSCAD 2015.03.15
$ -- Linux Mint 17.1 Rebecca x64  + OpenSCAD 2015.04.01.nightly

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