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9W is the answer. What is the question?

"Herr Wagner, you spell your name with a V?"
"Nien. W"

In all seriousness, I worked on VWs / Audis for a large chunk of my life, and this makes me grin hugely. Considering all the grueling hours of precise work it takes to machine parts for a miniature model engine, it seems almost unfair that we can do this with our printers in a few hours... except that our model would melt if ever operated.