Acrylic (a type of plexiglass)
Acrylic is the most commonly used engraving material after wood, it is easy to cut and engrave, comes in a variety of shapes and sizes, and is relatively inexpensive. There are two production processes for plexiglass: casting and calendering. The laser engraving machine mainly uses the plexiglass produced by casting, because the frosting effect produced by the laser engraving machine is very white, which is in sharp contrast with the original transparent texture. The plexiglass produced by the calendering method is still transparent after being engraved by the laser engraving machine, and there is no sufficient contrast effect. When buying plexiglass, you should emphasize to the dealer that high-purity seeds are required, otherwise the purchased materials may melt when engraving or cutting.
Sculpture 
In general, plexiglass is engraved on the back, that is to say, it is engraved from the front and viewed from the back, which makes the finished product more three-dimensional. When engraving on the back, please mirror the graphics first, and the engraving speed should be fast and the power should be low. If the power is too high during engraving, uneven stripes will appear on the bottom surface. If you want to carve deeper, you can try to carve several times. In the case of back carving, the local coloring should be carved deeper first, and then polished with a flame polishing machine before coloring can be added. Without polishing, the color seen from the front will not be uniform.
cut
Plexiglass is relatively easy to cut. If the customer's requirements are not high, it can be delivered after cutting without the need for flame polishing. Otherwise, the blowing device should be used when cutting to improve the quality of the cut. When cutting plexiglass over 8mm, the larger lens should be replaced.
Note: When using the laser engraving machine to cut plexiglass, the operator should not leave, and there may be flames during cutting. clean 
Use a damp cloth to clean the surface after engraving
coloring
Acrylic pigments can be used, other pigments may spoil the finish of the plexiglass.