3D pen Wire 3D Pen Filament Refills 1.75mm PLA Wire for 3D Printing Pen, Educational 3D Pen Wire 3D Doodler Pen & 3D Pen Refill Kit – Multicolor Non-Toxic Eco-Friendly Plastic – Smooth Drawing for Kids & Artists – Pack of 3, 5, 10, 20 (2.5m Each Roll)