HobbyistLaser
Head-to-head··Updated January 29, 2026

ComMarker B4 30W vs OMTech 30W MOPA: I Bought Both, Here's the Real Difference

Same wattage, same price bracket, completely different machines. I've spent real time on both. If you're choosing between them, the right answer depends on one question.

TL;DR — the one question

Color or no color? That's the entire post in three words. If you need vivid color marks on stainless — reds, blues, golds, anneal-blacks on titanium — you need the OMTech 30W MOPA. If you need maximum throughput on dark monochrome marks on aluminum, brass, hardened steel, and you don't care about color, the ComMarker B4 30W will out-pace it on every test I ran. I bought the B4 30W in mid-October 2025 and have been on it for three months. I bought the OMTech 30W MOPA about three weeks ago after I got tired of telling tumbler customers I couldn't do their gold-on-stainless logo. Both machines sit on the same bench, three feet apart, sharing a fume extractor. If I could rewind eight months and only own one of these to start, I'd buy the OMTech. The color unlock is bigger than the speed delta. I'll show you exactly why below.

ComMarker

ComMarker B4 30W Fiber Laser Engraver

The ComMarker B4 30W is the machine to buy when deep, production-speed engraving on metals is the priority and color marking is not required. The dual-lens system (110mm + 200mm, both included) is a genuine differentiator — you can mark fine detail on jewelry at 110mm and switch to a full A4-size workpiece at 200mm without a second machine or aftermarket purchase. If color marking is in your roadmap at all, buy the OMTech 30W MOPA at a similar price or the B4 30W MOPA variant instead — you cannot add color capability to a Q-switched machine later. For monochrome production marking at volume, this is a fast, capable machine with real workflow flexibility.

Read Full Review

OMTech

OMTech 30W JPT MOPA Fiber Laser Engraver

The OMTech 30W MOPA is the best-documented MOPA machine under $800 for buyers who want a community around them when they hit problems. The JPT source is proven, the 150mm work area is correct for most hobbyist use cases, and LightBurn compatibility on all platforms is a real advantage over EZCad-only competitors. Before buying ASIN B0DCFGK6PX, verify whether LightBurn is bundled — some OMTech variants at this price are EZCad-only, and you may need to budget $60 extra for a LightBurn Galvo license. The DOA shipping risk is real; order from a seller with a clear return policy. For MOPA color marking with the strongest community support under $800, this is the pick.

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The spec table that actually matters

Forget the marketing PDFs. These are the numbers I actually check before a job: Wattage: B4 30W | OMTech 30W Laser source: Raycus RFL-P30QS | JPT M7 MOPA Laser type: Q-switched (fixed pulse width) | MOPA (variable pulse width) Pulse width range: ~130-160ns fixed | 2-500ns variable Frequency range: 20-60 kHz | 1-4000 kHz Galvo speed (max): 15,000 mm/s | 10,000 mm/s Work area (default): 110x110mm with 110mm lens | 150x150mm Work area (alt lens): 200x200mm with 200mm lens | not applicable Focus: Motorized Z-axis | Manual focus Rotary included: Optional bundle | Yes, in the box Software in box: EZCAD2 + LightBurn (Galvo license sold separately, ~$60) | EZCAD2 (LightBurn varies by ASIN; verify your listing) Weight: ~19.5 kg | ~22 kg Color on stainless: No | Yes The two specs that matter most in this comparison are pulse width range and frequency range. Q-switched lasers have a fixed pulse width baked into the hardware. MOPA lasers let you sweep pulse width from 2ns to 500ns at the click of a parameter box in LightBurn. That single difference is the entire reason MOPA can color-mark stainless and Q-switch cannot. Wait — MOPA stands for Master Oscillator Power Amplifier. I had to look that up the first time someone said it to me. It just means the source has two stages: a low-power seed laser whose pulse width you can dial, then an amplifier behind it. The Q-switch on a Raycus is one stage with a fixed shutter speed. The galvo-speed line is what tricks people. The B4 lists 15,000 mm/s. The OMTech lists 10,000 mm/s. On paper the B4 looks faster, and on dark monochrome marks it actually is faster — see the throughput test below. But on color work, you cannot run anywhere near max galvo speed; you're at 800 to 1500 mm/s because the oxide layer needs dwell time to form. So galvo top speed is mostly irrelevant for color work and very relevant for deep-engrave throughput.

ComMarker

ComMarker B4 30W Fiber Laser Engraver

The ComMarker B4 30W is the machine to buy when deep, production-speed engraving on metals is the priority and color marking is not required. The dual-lens system (110mm + 200mm, both included) is a genuine differentiator — you can mark fine detail on jewelry at 110mm and switch to a full A4-size workpiece at 200mm without a second machine or aftermarket purchase. If color marking is in your roadmap at all, buy the OMTech 30W MOPA at a similar price or the B4 30W MOPA variant instead — you cannot add color capability to a Q-switched machine later. For monochrome production marking at volume, this is a fast, capable machine with real workflow flexibility.

Read Full Review

OMTech

OMTech 30W JPT MOPA Fiber Laser Engraver

The OMTech 30W MOPA is the best-documented MOPA machine under $800 for buyers who want a community around them when they hit problems. The JPT source is proven, the 150mm work area is correct for most hobbyist use cases, and LightBurn compatibility on all platforms is a real advantage over EZCad-only competitors. Before buying ASIN B0DCFGK6PX, verify whether LightBurn is bundled — some OMTech variants at this price are EZCad-only, and you may need to budget $60 extra for a LightBurn Galvo license. The DOA shipping risk is real; order from a seller with a clear return policy. For MOPA color marking with the strongest community support under $800, this is the pick.

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Setup: which one had me running first

Time-to-first-mark was almost identical. Time-to-first-good-mark was not. The OMTech showed up with the rotary already included in the box. The integrated body sat flat on the bench, I plugged in USB and power, opened EZCAD2, framed a square on a scrap aluminum tag, and had a mark in about 25 minutes. The mark itself was acceptable on default settings. EZCAD2 looks like Windows 95 software because it is Windows 95 software in spirit, but it works. About four hours later I had LightBurn talking to it through the EZCAD driver and I haven't opened EZCAD2 since. The B4 was a slower start. The detachable head and the dual-lens system are nice features once you understand them, and a real friction point on day one. You pick which lens to mount (110mm or 200mm), and then you have to go into LightBurn Device Settings and edit the corfile field size to match the lens. I didn't know that on day one. My first frame box covered roughly 1.7x the actual work area. I sat there at midnight wondering why the laser was trying to engrave the table. The fix is in the markcfg7 file ComMarker ships on the USB stick — you import that into LightBurn and the field size matches your installed lens. Twenty minutes once you know. Two hours if you don't. Also: the LightBurn Galvo license is not the same as the regular LightBurn license. If you already own LightBurn for a diode or CO2 machine, you still need the Galvo upgrade. That's another $60 on top of the machine. The OMTech needed the same license depending on which ASIN you bought — some OMTech listings bundle LightBurn, some don't. Read your specific Amazon title before you click buy. Net: OMTech got me to a usable mark faster. B4 got me to a fully calibrated dual-lens setup eventually. Both required LightBurn to be actually pleasant.

ComMarker

ComMarker B4 30W Fiber Laser Engraver

The ComMarker B4 30W is the machine to buy when deep, production-speed engraving on metals is the priority and color marking is not required. The dual-lens system (110mm + 200mm, both included) is a genuine differentiator — you can mark fine detail on jewelry at 110mm and switch to a full A4-size workpiece at 200mm without a second machine or aftermarket purchase. If color marking is in your roadmap at all, buy the OMTech 30W MOPA at a similar price or the B4 30W MOPA variant instead — you cannot add color capability to a Q-switched machine later. For monochrome production marking at volume, this is a fast, capable machine with real workflow flexibility.

Read Full Review

OMTech

OMTech 30W JPT MOPA Fiber Laser Engraver

The OMTech 30W MOPA is the best-documented MOPA machine under $800 for buyers who want a community around them when they hit problems. The JPT source is proven, the 150mm work area is correct for most hobbyist use cases, and LightBurn compatibility on all platforms is a real advantage over EZCad-only competitors. Before buying ASIN B0DCFGK6PX, verify whether LightBurn is bundled — some OMTech variants at this price are EZCad-only, and you may need to budget $60 extra for a LightBurn Galvo license. The DOA shipping risk is real; order from a seller with a clear return policy. For MOPA color marking with the strongest community support under $800, this is the pick.

Read Full Review

Throughput test on dark metal — the B4's home turf

I ran the same physical test on both machines. Same file, same material, same focus method, two days apart. Test piece: 50x50mm circular logo (a stylized R with a notch), filled, on a 3mm 6061 aluminum blank. Same blank stock from the same batch. Goal: a deep, dark, permanent mark you can read from across the shop. Settings on the B4 30W: 40 percent power, 1500 mm/s, 40 kHz, 0.04mm fill spacing, 6 passes. Result: a mark roughly 0.4mm deep, full black, no slag. Total run time: 2 minutes 18 seconds. Settings on the OMTech 30W MOPA: 40 percent power, 1000 mm/s, 200 kHz, 60ns pulse width, 0.04mm fill spacing, 6 passes. Result: a mark roughly 0.35mm deep, dark, slightly less aggressive than the B4 but visually similar. Total run time: 3 minutes 41 seconds. The B4 finished 1 minute 23 seconds faster on the same logo, and the mark was a hair deeper. On a 200-piece production run that delta compounds: the B4 saves you about 4 hours and 40 minutes of pure run time on that batch. That is real money if you are pricing per unit. Why is the B4 faster on dark metal? Two things. First, the Raycus Q-switch hits hard with a fixed pulse, and on monochrome marks you want hard hits. Second, the B4's galvo runs comfortably at 1500 mm/s where the OMTech starts to lose mark contrast above about 1100 mm/s. Both can be pushed, but the B4 has more headroom. If your business is metal ID tags, knife maker logos, deep-engrave plaques, brass nameplates, or any volume work where every mark is supposed to look the same shade of dark — the B4 wins. End of section. There is no scenario where the OMTech beats the B4 on dark monochrome throughput.

ComMarker

ComMarker B4 30W Fiber Laser Engraver

The ComMarker B4 30W is the machine to buy when deep, production-speed engraving on metals is the priority and color marking is not required. The dual-lens system (110mm + 200mm, both included) is a genuine differentiator — you can mark fine detail on jewelry at 110mm and switch to a full A4-size workpiece at 200mm without a second machine or aftermarket purchase. If color marking is in your roadmap at all, buy the OMTech 30W MOPA at a similar price or the B4 30W MOPA variant instead — you cannot add color capability to a Q-switched machine later. For monochrome production marking at volume, this is a fast, capable machine with real workflow flexibility.

Read Full Review

Color on stainless — the OMTech's home turf

The flip side. I ran the same physical test on both machines: a 6x8 grid on a 304 stainless steel coupon, X-axis frequency from 200 kHz to 1500 kHz, Y-axis power from 15 percent to 85 percent, fixed at 1000 mm/s and 60ns pulse width on the OMTech, fixed at 1000 mm/s and the Raycus's native ~140ns pulse width on the B4. Same coupon material, same surface prep (isopropyl wipe), same focus method. OMTech grid result: 48 squares, 41 of them visibly different colors. I got reds at 45 percent / 1000 mm/s / 60ns / 400 kHz — a clean fire-engine red, repeatable across three coupons. Golds and yellows around 35 percent / 800 kHz / 80ns. Blues at 25 percent / 600 kHz / 30ns. Purples in a narrow band near the blue region. Greens were the hardest to nail down but they exist. Anneal-black on titanium is a separate party trick that also works. B4 grid result: 48 squares of gray. Some squares were lighter gray, some were darker gray, two squares at high power were almost-black-but-burned. Zero color. This isn't the B4 having a bad day. The Raycus Q-switch fundamentally cannot hit the 60ns pulse width that produces red oxide layer on 304 stainless. The hardware doesn't bend that direction. ComMarker's own marketing copy for the B4 line says "limited color marking" for the Q-switch variant — which is corporate-speak for none of the rainbow stuff. If you want to make $20 tumblers with a brewery's blue-and-gold logo, the OMTech is the only one of these two machines that can do the job. The B4 will mark the tumbler in dark gray. That is a different product at a different price point and the customer notices. This is the moment I realized I'd bought the wrong first machine. Three months in, I had a B4 paying for itself on knife marking, and a queue of color-tumbler inquiries I had to turn down. The OMTech showed up three weeks ago and I'm already taking orders I would have lost.

OMTech

OMTech 30W JPT MOPA Fiber Laser Engraver

The OMTech 30W MOPA is the best-documented MOPA machine under $800 for buyers who want a community around them when they hit problems. The JPT source is proven, the 150mm work area is correct for most hobbyist use cases, and LightBurn compatibility on all platforms is a real advantage over EZCad-only competitors. Before buying ASIN B0DCFGK6PX, verify whether LightBurn is bundled — some OMTech variants at this price are EZCad-only, and you may need to budget $60 extra for a LightBurn Galvo license. The DOA shipping risk is real; order from a seller with a clear return policy. For MOPA color marking with the strongest community support under $800, this is the pick.

Read Full Review

Software: LightBurn on both, but read the listing

Both machines run LightBurn. Both also ship with EZCAD2 on a USB stick that you can install if you want to feel like it's 2003. The difference is licensing. ComMarker has been consistent: the B4 ships with the EZCAD2 software working out of the box, but the LightBurn Galvo license is a separate purchase. About $60. Always. There is no B4 SKU where this is bundled, as far as I have seen. OMTech is inconsistent across ASINs. Some listings explicitly bundle a LightBurn license. Some say "EZCAD Galvo Lens" in the title and you have to read three paragraphs into the description to figure out you need to buy LightBurn separately. The ASIN B0DCFGK6PX in particular reads ambiguous depending on when the listing was last edited. Before you buy, read the actual listing title and the bullet points carefully. If the price seems suspiciously low, the LightBurn license probably isn't included. Once you have LightBurn talking to either machine, the workflow is functionally identical. Material library entries port across machines if you keep the lens and source consistent. The OMTech also runs LightBurn on macOS and Linux. The B4 runs on Windows in practice, even though LightBurn itself is cross-platform — the EZCAD driver layer behind it is Windows-only, and that is the layer LightBurn talks to.

ComMarker

ComMarker B4 30W Fiber Laser Engraver

The ComMarker B4 30W is the machine to buy when deep, production-speed engraving on metals is the priority and color marking is not required. The dual-lens system (110mm + 200mm, both included) is a genuine differentiator — you can mark fine detail on jewelry at 110mm and switch to a full A4-size workpiece at 200mm without a second machine or aftermarket purchase. If color marking is in your roadmap at all, buy the OMTech 30W MOPA at a similar price or the B4 30W MOPA variant instead — you cannot add color capability to a Q-switched machine later. For monochrome production marking at volume, this is a fast, capable machine with real workflow flexibility.

Read Full Review

OMTech

OMTech 30W JPT MOPA Fiber Laser Engraver

The OMTech 30W MOPA is the best-documented MOPA machine under $800 for buyers who want a community around them when they hit problems. The JPT source is proven, the 150mm work area is correct for most hobbyist use cases, and LightBurn compatibility on all platforms is a real advantage over EZCad-only competitors. Before buying ASIN B0DCFGK6PX, verify whether LightBurn is bundled — some OMTech variants at this price are EZCad-only, and you may need to budget $60 extra for a LightBurn Galvo license. The DOA shipping risk is real; order from a seller with a clear return policy. For MOPA color marking with the strongest community support under $800, this is the pick.

Read Full Review

Support, when you actually need it

Both are Chinese-vendor-backed. Both have the same fundamental shape: 24-hour-ish response time, English support staff who are usually helpful and occasionally don't understand the question on the first pass. OMTech has the larger US-facing presence and the longer LightBurn-forum history. If you Google a problem on the OMTech 30W MOPA, you'll find someone who hit the same problem in 2023 and there's a thread with a fix. ComMarker has a tighter community on their own forum and Discord — fewer people, but ComMarker staff are visible and respond. The B4 product line is newer in the LightBurn forum so the searchable history is thinner. Neither is xTool-tier support. If your business model assumes 4-hour turnaround on machine downtime, neither of these is the right machine — go look at higher-tier industrial brands and pay accordingly. For a hobbyist or a small shop where a day of downtime is annoying but not catastrophic, both work. One caveat: I've read multiple secondhand reports of OMTech units arriving with shipping damage. My unit was fine. But the reports are real enough that I'd inspect the unit on arrival before clearing the delivery driver, and I'd buy from a seller whose return policy is clearly written.

ComMarker

ComMarker B4 30W Fiber Laser Engraver

The ComMarker B4 30W is the machine to buy when deep, production-speed engraving on metals is the priority and color marking is not required. The dual-lens system (110mm + 200mm, both included) is a genuine differentiator — you can mark fine detail on jewelry at 110mm and switch to a full A4-size workpiece at 200mm without a second machine or aftermarket purchase. If color marking is in your roadmap at all, buy the OMTech 30W MOPA at a similar price or the B4 30W MOPA variant instead — you cannot add color capability to a Q-switched machine later. For monochrome production marking at volume, this is a fast, capable machine with real workflow flexibility.

Read Full Review

OMTech

OMTech 30W JPT MOPA Fiber Laser Engraver

The OMTech 30W MOPA is the best-documented MOPA machine under $800 for buyers who want a community around them when they hit problems. The JPT source is proven, the 150mm work area is correct for most hobbyist use cases, and LightBurn compatibility on all platforms is a real advantage over EZCad-only competitors. Before buying ASIN B0DCFGK6PX, verify whether LightBurn is bundled — some OMTech variants at this price are EZCad-only, and you may need to budget $60 extra for a LightBurn Galvo license. The DOA shipping risk is real; order from a seller with a clear return policy. For MOPA color marking with the strongest community support under $800, this is the pick.

Read Full Review

What I'd buy now, with hindsight

If I could rewind to last October knowing what I know now, I'd buy the OMTech 30W MOPA first. Not the B4. Even with the slightly slower setup, even with the slower throughput on dark monochrome marks, the color-marking unlock is a bigger business asset than a 50 percent throughput advantage on a single category of work. Here's the simple decision tree: You mark knives, deep-engrave brass plaques, do high-volume monochrome ID tags, you don't care about color tumblers, and you want the dual-lens flexibility (110mm for fine work, 200mm for big plaques): buy the ComMarker B4 30W. You mark stainless tumblers in color, do jewelry that needs color contrast, want a single machine that handles both color and monochrome at acceptable speed, and you don't need 200mm work area: buy the OMTech 30W MOPA. You want both — buy them both, like I did. Three feet apart on the same bench. Run the OMTech for color jobs and the B4 for high-throughput dark engraving. The total cost is around $1,400 if you catch sale prices on both, which is less than a single ComMarker B4 60W MOPA at MSRP and gives you a redundant second machine when one is in a long production run. If budget forces a single machine and you're between these two, OMTech. The color capability is the bigger lever.

ComMarker

ComMarker B4 30W Fiber Laser Engraver

The ComMarker B4 30W is the machine to buy when deep, production-speed engraving on metals is the priority and color marking is not required. The dual-lens system (110mm + 200mm, both included) is a genuine differentiator — you can mark fine detail on jewelry at 110mm and switch to a full A4-size workpiece at 200mm without a second machine or aftermarket purchase. If color marking is in your roadmap at all, buy the OMTech 30W MOPA at a similar price or the B4 30W MOPA variant instead — you cannot add color capability to a Q-switched machine later. For monochrome production marking at volume, this is a fast, capable machine with real workflow flexibility.

Read Full Review

OMTech

OMTech 30W JPT MOPA Fiber Laser Engraver

The OMTech 30W MOPA is the best-documented MOPA machine under $800 for buyers who want a community around them when they hit problems. The JPT source is proven, the 150mm work area is correct for most hobbyist use cases, and LightBurn compatibility on all platforms is a real advantage over EZCad-only competitors. Before buying ASIN B0DCFGK6PX, verify whether LightBurn is bundled — some OMTech variants at this price are EZCad-only, and you may need to budget $60 extra for a LightBurn Galvo license. The DOA shipping risk is real; order from a seller with a clear return policy. For MOPA color marking with the strongest community support under $800, this is the pick.

Read Full Review

The third option people ask about

Every time I post about MOPA vs Q-switch, someone asks about the GWEIKE G2 Pro 30W at around $799. It's worth a paragraph. The G2 Pro is a Q-switched fiber with a wider 20-200 kHz frequency range, 15,000 mm/s galvo (same as the B4), and GWEIKE markets it as capable of "90 plus colors" via thermal oxidation on stainless. That claim is technically defensible — wider frequency range plus careful tuning produces visible color, and at least one published reviewer (DIY Life) confirmed greens and reds. It is not MOPA. It does not have variable pulse width. Colors are less consistent batch-to-batch and you can't anneal-black titanium the same way. If budget is tight and you want to dabble in color without full MOPA, the G2 Pro is a real option. If color is a serious part of your business plan, it is not a substitute for the OMTech. I haven't bought the G2 Pro myself — I'm including it because the question comes up every week, not because I've run my standard tests on it.

GWEIKE

GWEIKE G2 Pro 30W Fiber Laser Engraver

The GWEIKE G2 Pro is the fastest Q-switched fiber laser under $900 and the only machine in this price range that can produce visible thermal oxidation color on stainless steel without a MOPA source. The color is not MOPA-quality — it requires experimentation and is inconsistent batch-to-batch — but it exists, and nothing else at $799 can say the same. For deep engraving at maximum speed with color as a secondary capability, nothing competes. For consistent, repeatable color marking on tumblers or jewelry production, the OMTech 30W MOPA at $100 less is the more appropriate choice — it delivers true MOPA color repeatability that the G2 Pro's frequency tuning cannot match.

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Frequently Asked Questions

Is OMTech's MOPA actually JPT, or a rebadge?

Confirmed JPT M7. The Amazon title states JPT Source explicitly, and the behavior matches: 2-500ns pulse width range, 1-4000 kHz frequency, and the 100,000-hour MTTF spec is the JPT M7 datasheet number. It is not a rebadged generic. The same source ships in machines priced $2,000 and up on OMTech's own site.

Does ComMarker make a MOPA version of the B4?

Yes — separate ASIN. The B4 30W JPT MOPA lives at ASIN B0DRY12JMW and is a different machine from the standard B4 30W (B0C2PVXG4G) covered in this comparison. They share the same body and the names look nearly identical. If you want ComMarker color capability, verify the listing title says JPT MOPA before clicking buy. The Raycus Q-switch B4 cannot color-mark.

Which one is better for tumblers?

OMTech, by a wide margin. The MOPA color capability plus the bundled rotary axis make tumblers a turnkey use case. The B4 will mark a tumbler in dark gray with a rotary attachment, which is a fine logo but is a different product than the color logos most tumbler customers want.

Which one for knife makers?

ComMarker B4. Deeper, faster monochrome marks on hardened steel. The 200mm lens covers full blade length without repositioning. The B4 throughput advantage on dark metal means a knife shop running 50 blades a week saves real time. Knife color marking is not a thing customers ask for, so the OMTech advantage doesn't apply.

Can I color-mark with the B4 if I tune it carefully?

No. This is the question that gets asked most and the answer is the firmest no in the post. The Raycus Q-switch source has a fixed pulse width around 130-160ns. Color oxidation on 304 stainless requires hitting pulse widths between roughly 30ns and 80ns — physically outside what the Raycus hardware can produce. No amount of LightBurn parameter tuning will move the pulse width on a Q-switch laser. If color is in your roadmap, get a MOPA.

Gear Mentioned in This Note

Machines referenced above. Read our full review before pulling the trigger.

ComMarker B4 30W Fiber Laser Engraver

8.2

ComMarker · $699

Read ReviewBuy on Amazon

OMTech 30W JPT MOPA Fiber Laser Engraver

8.4

OMTech · $699

Read ReviewBuy on Amazon

GWEIKE G2 Pro 30W Fiber Laser Engraver

8.3

GWEIKE · $799

Read ReviewBuy on Amazon

Related Field Notes

Troubleshooting

Six Months, Two Machines, Six Real Problems: My Fiber Laser Troubleshooting Log

Focus drift, fading marks, EZCAD ghosts, a galvo speed cliff, and the lens scuff that cost me a Sunday. Every problem I have actually hit, with the fix.

Project log

200 Brewery Tumblers in 11 Days: What a Real Production Run Cost Me

A local brewery ordered 200 color-logo tumblers. I quoted, ran them on the 30W MOPA, and tracked every minute. Here are the numbers, the fail rate, and what I'll change next time.

Technique

Color-Marking Stainless on a 30W MOPA: My Working Settings (and the Failures That Got Me There)

Vivid blues, golds, and reds on stainless are repeatable on a 30W JPT MOPA. Here's the exact pulse-width / frequency / speed grid I run, and the four mistakes that wasted my first weekend.