OMTech K40+ specs
| Brand | OMTech |
|---|---|
| Laser type | CO2 (10.6 µm CO2 glass tube) |
| Output power | 45 W CO2 tube rating (OMTech figure, not a measured output) |
| Format | Enclosed |
| Work area | 300 × 200 mm (11.8 × 7.9 in). Honeycomb bed; detachable base for taller objects |
| Max speed | 300 mm/s (maker rating) |
| Laser class | Not stated — treat as Class 4 |
| Cuts wood | Up to 8 mm (maker claim) |
| Clear acrylic | Yes |
| Metal | Coated metal only |
| Air assist | Built in |
| Camera | No |
| Autofocus | No |
| Rotary | Optional add-on |
| Software | LaserGRBL (pre-installed), LightBurn |
| Connectivity | USB |
| Weight | 81.8 lb |
| Warranty | Listing promises '2 years of comprehensive service'; OMTech's help center says K40+ tubes carry a 6-month warranty |
| Price tier | $$ Mid-range ($500–$1,500). See Amazon for today's price. |
- '45W' is the advertised tube rating. Glass CO2 tubes in this class typically deliver less than the label and fade with age, and OMTech publishes no measured output.
- Cut depth conflict: the 45 W Amazon listing claims 8 mm wood and 10 mm acrylic; OMTech's K40/K40+ help-center FAQ says 3 mm wood and 5 mm acrylic and that the series doesn't support a rotary, yet a 'with Rotary Axis' bundle is sold on Amazon. The FAQ may predate the 45 W upgrade.
- Laser class isn't stated on the listing. It has a door interlock and emergency stop, but treat it like any Class 4 CO2: never defeat the interlock.
- Two OMTech-sold listings with the same title showed $759.99 (B0GK8VXW45, few reviews) and $799.99 (B0DFM5L5MD) on Oct 29, 2026.
- Amazon lists the item weight as 81.8 lb; plan on a two-person lift and a sturdy bench.
Bundles and power options
Each option is a separate Amazon listing. Prices are typical street prices, not live.
| Option | What's different | Price |
|---|---|---|
| K40+ 45W | Our pick: machine with water pump | Check price |
| K40+ 45W + rotary axis | Adds a rotary for cups and bottles | Check price |
| K40+ 45W + CW-3000 chiller | Replaces the bucket-and-pump cooling with a chiller | Check price |
Specs are compiled from manufacturer listings and independent reviews and may change between production runs. Laser makers re-bundle often, so confirm what's in the box on the Amazon page before buying.
The OMTech K40+ is a desktop CO2 laser with a 45 W-rated glass tube, a 300 × 200 mm bed and built-in air assist, exhaust fan and water pump, for about $760–800 (check today’s price). It’s the cheapest way in our guide to cut clear acrylic and engrave glass, jobs no blue diode can do. In exchange you get an old-school machine with water cooling, mirror alignment, no camera and cut figures that OMTech’s own pages don’t agree on. If you’re unsure whether you need CO2 at all, read diode vs CO2 vs fiber or try the laser matcher.
Who the K40+ is for (and who should skip it)
It’s for tinkerers on a budget who need what diodes can’t do: clear acrylic signs and keychains, frosted glassware, leather and fabric. It suits people who enjoy learning how a machine works, because owning one means aligning mirrors, managing a coolant loop and focusing by hand.
Skip it if you want a plug-and-play experience. The xTool P2S is a very different class of easy, with cameras, autofocus and a far bigger bed, at several times the price. Skip it too if you don’t need clear acrylic or glass. An enclosed diode such as the Creality Falcon A1 Pro is simpler to live with, and an open-frame diode such as the Longer Ray5 40W claims thicker wood cuts.
Key capabilities
The CO2 wavelength is the reason to buy. It cuts clear cast acrylic with polished edges, frosts glass, and handles wood, leather and fabric. Check specific materials in the material checker. Bare metal is out; like any CO2 laser it only marks coated or anodized metal.
How thick it cuts is genuinely unsettled. The 45 W Amazon listing claims 8 mm wood and 10 mm acrylic; OMTech’s K40/K40+ help-center FAQ says 3 mm wood and 5 mm acrylic. The FAQ may predate the 45 W upgrade, but we wouldn’t buy it counting on the higher figures. The “45W” itself is a tube rating, not a measured output, and glass tubes fade with age. Our wattage explainer explains why CO2 and diode watts aren’t comparable.
The bed is small at 300 × 200 mm (12 × 8 in), with a honeycomb and a detachable base for taller objects. Rated speed is 300 mm/s.
Day-to-day use
GoLaserGo found the K40+ solid and LightBurn-friendly. LaserGRBL comes pre-installed and LightBurn works over USB, so you’re not stuck with clunky bundled software. There’s no camera and no autofocus, so you’ll focus manually for every material and position jobs by framing.
The built-in features are decent for the price: auto-adjusting air assist, an exhaust fan, a water pump, a door interlock and an emergency stop. The water-cooled tube runs with the included pump in a bucket, or you can buy the CW-3000 chiller bundle (about $920). At 81.8 lb, it’s a two-person lift onto a sturdy bench.
What you’ll need beyond the box
- Ventilation. CO2 cutting makes heavy smoke. Duct the built-in exhaust outside with 4-inch aluminum ducting, and add an inline duct fan for long runs; check the exhaust port diameter first. See our ventilation guide.
- Eye protection. OMTech doesn’t state a laser class on the listing, so treat it as Class 4. Keep the door shut and never defeat the interlock. Blue-diode glasses don’t protect against a 10.6 µm CO2 beam; any eyewear has to be rated for that wavelength.
- Air assist. Built in.
- Cooling. Plan a spot beside the machine for the pump-and-bucket water loop, or pay about $120 more for the chiller bundle.
- Rotary. Unclear (see the FAQ). A rotary bundle is sold for about $900, but OMTech’s own help center says the series doesn’t support one.
- Materials and fire safety. Clear cast acrylic to get started, plus an ABC extinguisher. The safety guide covers the rest.
Reliability and warranty
The listing promises “2 years of comprehensive service”, but OMTech’s help center says K40+ tubes carry a 6-month warranty, and the tube is the part that wears. Two OMTech-sold listings with the same title showed $759.99 and $799.99 on October 29, 2026; the cheaper one had few reviews, so compare the seller and box contents.
Bottom line
The K40+ is the budget door into CO2: for about $800 it cuts clear acrylic and engraves glass, and GoLaserGo rated it solid and LightBurn-friendly. Expect a small bed, a water-cooled tube, mirror alignment and no camera, and don’t count on OMTech’s higher cut figures. If you can stretch, the P2S is far easier; if you don’t need clear acrylic, an enclosed diode is simpler. More options are in our laser for small business guide. Check today’s price and bundles on Amazon.
Accessories for the OMTech K40+
Official and universal add-ons sold on Amazon — safety glasses, fume extraction, air assist, rotaries and materials. Check the listing confirms your exact model before you buy.
- SafetyCARLANY 190–490 nm OD6+ laser safety glassesUniversal fit
Blue-diode protection for anyone near an open-frame laser, or when you lift the lid or override an interlock on an enclosed one. Covers 445–455 nm blue diodes only; does not protect against 1064 nm IR/fiber or 10.6 µm CO2. Match the OD rating to your laser's wavelength.
- SafetyAmerex B417T 2.5 lb ABC fire extinguisher with bracketUniversal fit
Lasers cut by burning; a small ABC extinguisher mounted beside the machine is the cheapest fire insurance you can buy. Dry-chemical powder can ruin a laser's optics and electronics; LightBurn recommends a CO2 extinguisher for the machine itself.
- SafetyAmerex 322 5 lb carbon dioxide (CO2) fire extinguisherUniversal fit
Class B:C CO2 leaves no powder residue, so it puts out a fire in the machine without destroying the optics. Pricier than ABC; not rated for Class A (wood/paper) fires on its own, so keep a fire blanket too.
- SafetyPrepared Hero emergency fire blanket, 39 × 39 in (2-pack)Universal fit
Smothers a flare-up on the bed without coating the machine's optics in extinguisher powder.
- Fumes & enclosureAC Infinity Cloudline S4 4-inch inline duct fan with speed controllerUniversal fit
Boosts a laser's built-in exhaust over long duct runs so smoke actually leaves the room. Check your machine's exhaust port diameter; adapters may be needed.
- Fumes & enclosureVIVOSUN 4-inch aluminum ducting, 25 ft with clampsUniversal fit
Replaces short stock hoses so you can reach a window or wall vent; foil duct tolerates hot exhaust better than vinyl.
- Materials3 mm basswood plywood sheets, 12 × 12 in (12-pack)Universal fit
The default test and project stock for every laser here; 12 × 12 in fits all but the smallest beds. Cut down for the 150 mm A1C or galvo machines.
- MaterialsClear cast acrylic sheets, 12 × 12 × 1/8 in (10-pack)Compatible, third-party
Cast acrylic cuts with flame-polished edges on a CO2 laser; it's the material that justifies buying one. CO2 only: blue diodes pass straight through clear acrylic.
- MaterialsVIBRATITE 4-inch square black slate coasters (60-pack)Universal fit
Best-selling laser blank: slate engraves light grey on black with any diode, CO2 or IR source.
- MaterialsLaserable leatherette hat patches with adhesive, 3 × 2 in (50-pack)Universal fit
Cheap, fast-selling patch blanks that engrave cleanly with diode and CO2 lasers. Not for fiber-only lasers such as the ComMarker B4.
Compatibility checked October 2026. More in our laser engraver accessories guide.
Featured in our guides
- The Best Laser Cutter for Wood in 2026: CO2 and High-Power Diode Picks
- Diode vs CO2 vs Fiber Laser: Which Type Do You Actually Need?
- xTool S1 40W vs xTool P2S 55W: Enclosed Diode or Desktop CO2?
- Laser Engraver Wattage Explained: Optical vs. Electrical Watts
