The World's Best Kid-Safe 3D Printing Pen for Creative Kids. 3Doodler engages kids' imagination, giving them the tools to express their ideas visually with the press of a button!3D Printing Pen for Kids The 3Doodler Start+ 3D pen extrudes plastic that hardens quickly and is completely safe to touch -- no hot parts, messy resin or sticky glue! Kids who love to draw, invent and problem-solve in 3D will discover the perfect creative outlet with this innovative creative tool.How to Use Your 3Doodler Start+ Turn on the pen and wait for the LED light to turn from solid red to solid green. Press the orange button to start the pen, then insert a colourful strand of plastic into the back until you feel it grip. After a few seconds, plastic will start to extrude from the nozzle tip. You can change strand colours once you've run through a complete strand of plastic. When you are done doodling, press the orange button again to stop the pen. To conserve battery life, turn the pen off before storing