How much oxygen does a fiber laser use
So you need to use a 30W or 50W fiber laser for upgrading the engraving area to 7.87" x 7.87" or 11.81" x 11.87".
Gulf States Saw & Machine Co., FM1212-50S uses a Raycus 50W solid-state fiber laser with the fiber source having a lifetime of 100,000 hours.