At the intimate Christmas market outside, a young fellow at a stall offered us several samples of snaps warming, herb-infused Scandinavian spirits and a plate of heart-shaped waffles dusted with sugar and jam to eat while we chatted about his hometown.

WSJ: Visiting Copenhagen in Winter

He did just that, leading the final 78 laps on the 312-lap race around PIR's odd-shaped oval in the first non-restrictor-plate race with NASCAR's new Gen-6 car.

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So far, however, the rapid-prototyping machine simply produces an accurately shaped mould from which the plate is cast.

ECONOMIST: MONITOR