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How to Use 1. Connect USB cable one end to the pen and other end to power source through DC 5V ~ 3A. 2. Press the power button . The light will turn red to show 3D Pen is heating up. 3. When the light turn blue means the pen is ready for use . Insert one end of filament into the loading hole . Insert the filament gently until it reaches the stop . Press and hold insert button and you will notice that the filament gently being fed into the pen. 4. When you see the filament appears at the nozzle .Press and then release the print button for continues printing. 5. To pause printing press and then release the Print button.