Which is better for deep engraving on steel?

The SFX Laser. It publishes a 0.1–1 mm marking depth and a 300 mm thickness limit at the 110 x 110 mm lens. The OMTech page gives no depth figure.

The OMTech, at a rated 10,000 mm/s against 7,000 mm/s for the SFX. Real throughput also depends on hatch spacing and how often you refocus.

Do I need 50W, or is 20W enough?

For surface marks on jewelry and serial plates, 20W covers most jobs. For deep engraving or faster fills on steel and brass, 50W is the safer pick. The SFX lets you choose; the OMTech is 50W only.

Which has the bigger work area?

The OMTech offers 5.9 x 5.9 in or 4.3 x 4.3 in. The SFX figure of 110 x 110 mm equals 4.3 x 4.3 in, so the OMTech's larger lens is bigger.

Is one worth the extra money?

No price is listed for either here, so check current store prices on Deal.ai. Pay more for the OMTech only if autofocus and the higher speed matter; pay for the SFX if you need depth and power choice.

Can either mark plastics?

The SFX page lists ABS, PC and PVC alongside metals. The OMTech page focuses on metals such as jewelry and precious metals and does not list plastics.

OMTech 50W Fiber Laser Marking Machine vs Tabletop Large Format Fiber Laser Marking Machine Iron Steel Brass Marking 20w 50w Deep Engraving Fiber Laser Marking Machine

Buy the OMTech 50W if you want a documented, single-power fiber marker with automatic focusing, a stated ±1 mm accuracy and a 10,000 mm/s top speed for jewelry, serial numbers and color marking on metals. Buy the SFX Laser unit if you need deep engraving on thick steel or brass and want to pick 20W, 30W or 50W for your budget. Neither page gives a store or a price, so compare live listings on Deal.ai before you commit.

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