mysweety 2 in 1 5500mw cnc 3018pro-m engraver machine, grbl control 3 axis diy cnc router with 5.5w module kit, plastic acrylic pcb pvc wood carving milling engraving machine with offline controller mysweety ●offline controller advantages: take control of your 3018pro-m desktop cnc machine with offline control, provide manual control of your mill without any computer. ●it’s built on arduino and grbl (both open source) support, tutorials, additional training, and new ideas to try are plentiful and easy to find elsewhere online. so that you can find many tutorial video on internet. ● if you encounter any problems while using this machine, please feel free to contact us at bigbangamazon@yahoo.com. our customer service team is always here to help. thank you!