Hello,
You don't really need something 3D printed, to see what the finished product will look like. Just have one machined, and it will probably be as cheap or cheaper than the 3d print. From what I've seen, they charge a good penny for that. Plus, you can install it, and test it, where you can't the plastic model.
You can model it in 3D, but the machine shop drawings need to be in 2D, showing the dimensions. That is unless you want to use the 3D file to convert it to CNC with a machining app.
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