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Yeah, I think so too. They work, but I think there is a happy medium.. Here is the size increase on the 3D Print at 103%:
100%
x: 51.5 mm
y: 51.6 mm
z: 51.36 mm
103%
x: 51:689 mm
y: 51:689 mm
z: 51:562 mm
I don't know how to translate this into a properly sized increase.
Can you clarify what you mean? The helmet is a complex shape, but if you know what the measurement of one feature is relative to a marker, the rest of the model will of course scale proportionately.
i.e. I think if we know that the measurement we want from top to bottom on what's sometimes called the 'vocoder' or grill -- is x mm when the helmet is viewed head on, you could draw a vertical line the required distance and scale the whole model against that line. That's what I would in Rhino, but I'm guessing this thing was sculpted in ZBrush or similar. I find Zbrush to be more of a pain for precise measurements, but it's not impossible. You could even save the Zbrush model as .obj and port it to something like Rhino ...