low light positioning sculpture preview, grayscale engraving, contour engraving, solid engraving Note: In order to avoid burning the circuit board, we will unplug the X, Y axis before shipment two lines. Pro-received in accordance with the instructions can be inserted after the wiring. This laser engraving machine cannot engrave the following materials: Metals (whether thick or thin), stones, ceramics, jewels, reflective materials, colorless transparent materials, soft materials. This laser engraving machine can engrave the following materials: Wood, plastic, paper, bamboo, horns, leather (purse), plastic phone case, rubber stamp, photosensitive seal, sponge paper, etc. Engraving materials: Wood, plastics, paper, bamboo, horns, and some cortex (purse), cell phone plastic shell, rubber stam