Diode laser · Open frame · AtomStack
AtomStack A70 Max
Makers and small shops who mainly cut thick wood and dark acrylic and have a garage or workshop with proper extraction
from $1,639 at AtomStack, checked Oct 2
Image: AtomStack. Prices change often; the shop shows the current price.
Quick verdict
The A70 Max is AtomStack's big open-frame diode with a claimed 70W of optical output, switchable to 35W, on an 850 x 800 mm bed. That power is the whole point: AtomStack claims 28 mm paulownia and 25 mm black acrylic in a single pass, which is depth you normally associate with a CO2 tube. It ships with an adjustable air pump, auto focus, a touch screen for offline work, and flame, tilt and emergency stop protection. The trade-offs are a 400 mm/s top speed, a frame that needs a large bench, and an open 70W blue beam that makes a lot of smoke and reflected light. Treat the power figure as a maker claim, because we found no independent measurement.
What you still need
Honeycomb panels (the Basic Bundle with four F4N panels costs $100 more), proper exhaust or the B4 enclosure (about $690 more in bundle pricing), the R8 Pro rotary roller (about $200 more via the Pro Bundle), extra 455 nm rated glasses for anyone else in the room, and a LightBurn licence if you outgrow AtomStack Studio and LaserGRBLMaterial reality check
Cuts wood, plywood, MDF, leather, card and dark opaque acrylic; the 25 to 28 mm one-pass claims are for paulownia and black acrylic, so expect less in hardwood. Engraves slate, stone, ceramic, anodised aluminium and coated metals, and can surface-mark stainless steel. It cannot cut metal in any useful way, and like every diode it cannot cut clear or blue acrylic. Never cut PVC or vinyl: the chlorine fumes are toxic and corrode the machine.Better alternative if
you need a Class 1 enclosed machine you can run in a shared room, and can live with thinner cuts: xTool S1 40WScores
Scored on the same scale for every laser on this site. See all lasers ranked.
Specifications
| Laser type | Diode laser |
|---|---|
| Form | Open frame |
| Optical power | 70 W |
| Other modules | Same module switches to a 35W mode (maker lists 35-39W) with a smaller 0.08 x 0.12 mm spot for detail engraving |
| Wavelength | 455 ± 5 nm |
| Work area | 850 × 800 mm |
| Max speed | 400 mm/s (24,000 mm/min) |
| Cutting (maker claim) | 28 mm paulownia and 25 mm black acrylic in one pass (maker claim) |
| Precision | 0.01 mm engraving accuracy (maker claim) |
| Air assist | Included |
| Camera | No |
| Autofocus | Yes |
| Rotary support | Yes |
| Safety | Open frame with an exposed Class 4 beam; flame alarm, emergency stop button and gyroscope tilt detection; enclosure sold separately |
| Connectivity | USB-C, Wi-Fi, Offline via 4.3 in touch screen |
| Software | AtomStack Studio, LightBurn, LaserGRBL |
| Weight | 19 kg |
| Price | from $1,639 at AtomStack, checked Oct 2 |
Pros and cons
Why we like it
- Claimed 70W optical output cuts thick softwood and dark acrylic in one pass where 20W machines need several
- Huge 850 x 800 mm bed takes large signs and batches of parts
- Air pump with 0-60 L/min adjustable flow is in the box
- One-key auto focus and a 4.3 inch touch screen for offline jobs
- Flame alarm, emergency stop and tilt detection come as standard
Watch out for
- A 70W open beam throws a lot of smoke and glare, so it needs a ventilated workshop or the B4 enclosure, which adds about $690 in AtomStack's bundle pricing
- 400 mm/s top speed is slow for photo engraving across such a big bed
- 1056 x 1128 mm footprint takes a whole bench, and the frame arrives as parts to assemble
- No camera, so positioning relies on the red cross and framing
- Spec sheet is sloppy: the listed 12V 5A power supply cannot feed a 70W module, and we found no independent power test
Compare with
Frequently asked questions
What materials can the AtomStack A70 Max cut and engrave?
Cuts wood, plywood, MDF, leather, card and dark opaque acrylic; the 25 to 28 mm one-pass claims are for paulownia and black acrylic, so expect less in hardwood. Engraves slate, stone, ceramic, anodised aluminium and coated metals, and can surface-mark stainless steel. It cannot cut metal in any useful way, and like every diode it cannot cut clear or blue acrylic. Never cut PVC or vinyl: the chlorine fumes are toxic and corrode the machine.
What else do I need to buy with the AtomStack A70 Max?
Honeycomb panels (the Basic Bundle with four F4N panels costs $100 more), proper exhaust or the B4 enclosure (about $690 more in bundle pricing), the R8 Pro rotary roller (about $200 more via the Pro Bundle), extra 455 nm rated glasses for anyone else in the room, and a LightBurn licence if you outgrow AtomStack Studio and LaserGRBL
How much does the AtomStack A70 Max cost?
From $1,639 at atomstack, checked oct 2.
How we rank: by our own scores for power, speed, ease of use, safety and value, from the maker's published specs and independent tests where they exist. Some links earn us a commission (for example TwoTrees, SainSmart, Gweike and Amazon). That never changes a score or the order of a list (disclosure).
Sources
- AtomStack A70 Max product page and spec table
- AtomStack A70 Max Shopify product data (prices)
- AtomStack X70 Max product page (same 70W module, input power)
- LightBurn forum: Atomstack A70 Max X axis