Gyroscope keyring trinket
thingiverse
The well known idea with new design. - external diameter is 3.5 cm - internal ball - colored overlays - rotatable anchor ring Note: The model not horizontally, strongly recommend layer height about 0.1 mm. Required disassembling for two internal rings for insert overlay ring. Also you need a glue for the external ring overlay (internal as wish). On rotatable version, possibly need a bit help by knife for anchor ring on external side if that stuck after printing. 
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