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Micron frame with motors and pulley for upper rotor.
Main motor 6mm 6ohm (1.3g), tail motor 4mm 30ohm (0.4g) both from Didel.
Note the twisted rubber band - to get the upper rotor to spin CCW.
Rubber band at tail, 0.15mm, weight less than 0.01g.

Micron frame

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