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This once specialist hobby has reached new audiences during the lockdown. CNC (Computer Numerical Control) machining has always been a common manufacturing method in applications such as engines, mobile phones, and in high-precision products such as watchmaking. The CNC milling process uses a wide range of cutting tools called endmills, which are controlled by a computer programme that reads and translates a design, which has been inputted by the user to follow a specific path to form the finished product. In hobby CNC routers, off-the-shelf wood trimming routers are used for convenience and simplicity.