How are MOST 4D printed objects different from MOST 3D printed objects?
O
The 3D printed object is supposed to change shape over time.
O
The 4D printed object is supposed to change shape over time.
O
The 4D printed object is usually recyclable, but the 3D printed object usually is not.
The 3D printed object is usually recyclable, but the 4D printed object usually is not.
