Flashforge Inventor II is the newest filament-based 3D printer designed for children and complete beginners who are looking to venture into 3D printing. It packs many safety features that is crucial due to the hot build chamber temperatures. The intelligent sensor on the door automatically stops print when doors are opened and closed. The print head is enclosed so that prying hands are protected from the high temperature Flashforge Inventor II uses PLA filament, which is a biodegradable material that is totally safe to use indoors and in classrooms. At just 50dB, it is one of the quietest 3D printers available and is suitable for classrooms as well. So teachers can continue holding lectures while Inventor II builds stunning designs. SPECIFICATIONS Printing Technology: FFF (Fused Filament Fabrication) Build Volume: 150L X 140W X 140H mm (5.9 X 5.5 X 5.5 in) Layer Resolution: 50~400 microns (0.0039~0.019 in) Positioning Precision: XY: 11 microns [0.0004 in] Z: 2.5 microns [0.0001 in] Filament Diameter: 1.75 mm [0.069 in] Nozzle Diameter: 0.4 mm [0.015 in] Filament Support: PLA, PLA Color Change, Pearl, Elastic, TPU, Flexible Filament, Metal Filled and Wood Filled MECHANICAL & DIMENSIONS Frame & Body: Plastic Alloy Extruder Quantity: One Product Dimension: 420 x 420 x 570 mm [16.5 x 16.5 x 21.5 in] Shipping Dimension: 500 x 500 x 500 mm [19.7 x 19.7 x 19.7 in] Product Weight: 20KG Shipping Weight: 28KG SOFTWARE & ELECTRICAL Software & Firmware: FlashPrint File Type: STL, OBJ, 3MF, FFP Operating Systems: Windows XP/Vista/7/8/10, Linux, Mac OS X Connectivity: Wi-Fi, USB Cable, USB Stick Language Support: AC Input: 115-230 V, 50-60 Hz, 150 W