LeapFrog Creatr HS Manual page 6

Push the filament in from the bottom, the same way you would with normal filament.
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Open the extruder all the way by pulling the handle backwards as far as possible.
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Keep pushing the filament through the extruder until it is half way in the extruder:
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Note: The rest of the printer is not visible only for clearness of the image.
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