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The US pennies are actually closer in size to the 0.02 euro coins, and I've just added a version of the flywheel with a slightly smaller diameter so the 0.02 euro will fit snugly. Also note that RobertCL has done a flywheel remix for 1p UK coins (http://www.thingiverse.com/thing:794106).

Gyroman - UK 1p Compatible Flywheel