How To Make 3D Led signage Letter With Cnc Machine. How to use the Cnc Router Cutting engraving machine to engrave acrylic, the following Cnc Router will take you to learn the process of Cnc Router Make Signs 3D Letters. How to use the Cnc Router Cutting engraving machine to engrave acrylic, the following Wuxi Cnc Router will take you to learn the process of Cnc Router Make Signs 3D Letters.(And The steps Operation For Cnc Router To Cut Signage LED Letter Video at here ) All steps For Cnc Router Machine To Make 3D Signs LED Letters: 1. Material selection: If you want to do engraving, the first step is to consider cutting and engraving materials. Generally speaking, the acrylic sheets we use are all prescribed materials. According to customer needs, we first choose a similar material , It is bigger than the customer's stipulation, and it is impossible to make it smaller. 2. Cutting: After the material is selected, the size is definitely difficult to be the same as the size required