How Deep Can a 50W Laser Engrave? A 50W deep engraving fiber laser marking machine removes material at depths up to 0.5mm in a single pass on mild steel, and up to 1mm with multiple passes. This is the machine for mold and die shops, tool manufacturers, and parts that require permanent identification marks that survive machining, plating, and wear. The higher power density of a 50W source also speeds up marking on large parts and reduces cycle time on high-volume production.