The RP-300B 3D printing pen is a low-temperature 3D pen. It connects via a USB power cord and can be used as long as the adapter provides 5V 1A. Easy to use – Simply plug in the power, heat up the 3D pen, insert PCL filament into the hole, press the filament loading button, and then extrude the filament through the nozzle. We randomly provide PCL filaments in 10 colors. Material used – PCL consumables are more eco-friendly. PCL materials have a low melting point and are biodegradable, environmentally friendly substances. The PCL filament (60-90) can be used, with a filament diameter of 1.75 ± 0.02 mm. The 10-color PCL filament we provide does not produce toxic substances during the heating process. You and your family can use it safely without polluting the environment. It is non-toxic, odorless, and safe. Suitable for children – The low-temperature 3D printing pen is the perfect gift to help children create masterpieces, improve their spatial thinking ability, and stimulate creativity and imagination. At the same time, this 3D pen is also ideal for parents and children to enjoy leisure time together and bring their wonderful ideas to life.