BallChain Gear parametric OpenSCAD

_Parametric ball chain gear._

Feel free to modify it for your use!
It's really basic at construction, not to fancy ;D

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Parametric Preview:
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//Shaft Settings
dShaft = 4;
depthFlatShaft = 3.5;
height = 7;

//BallChain Settings
dBall = 2.7;
wRope = 0.55;
nBalls = 10;
distanceBallToBall = 3.4;

//Calc Outer Diameter of Gear
dOuter = nBalls * distanceBallToBall / 3.141592653589793;