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If you make the number of columns odd, won't it naturally lead to centered LEDs?

The axis of rotation needs to lie in the plane that the LEDs lie in. At the moment, the axis of rotation lies in the plane of the circuit board.

Imagine the LED circuit board placed flat on a table. He's talking about adjusting the position of the LEDs in the vertical direction, which means adjusting the position of their board. Moving the LEDs relative to their board won't help.

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