... . High speed, high precision 4. Low cost cheap cnc multi head machine with stepper motor Advantages: 1) Advanced design: Modularizing product ... mend. Features:1.The model of this machine with 4 head can do engraving work with high efficiency equipped with advanced ... , wooden craft product, etc., also can process iron, copper, aluminum. plastic board, plank and so on, which are metal or nometal ...