Diode laser · Enclosed · SainSmart
SainSmart Genmitsu L8 20W
Home users who want a 20W diode in a real Class 1 enclosure with camera and air assist in the box
from $699 at SainSmart, checked Oct 2
Image: SainSmart. Prices change often; the shop shows the current price.
Quick verdict
The Genmitsu L8 is SainSmart's enclosed diode laser, sold as a 20W at $699 or a 40W at $1,199. The 20W gives a 400 x 400 mm bed inside a Class 1 enclosure with a door sensor, flame sensor, tilt stop, key switch and emergency stop, and it ships pre-assembled with an air pump, honeycomb and a LightBurn-compatible camera. SainSmart rates it at 40,000 mm/min, quick for a gantry diode. The compromises are manual focus with gauge blocks and a thin spec sheet that leaves out the machine weight. For an indoor-friendly 20W with everything in the box, it is strong value.
What you still need
Venting the exhaust out a window or SainSmart's optional air purifier, a rotary roller for cylinders, a fire extinguisher, and a LightBurn licence if you want the camera workflow (CutLabX is free)Material reality check
Cuts plywood, basswood, cardboard, leather, felt, fabric and dark opaque acrylic. Engraves wood, leather, stone, ceramics, stainless steel and coated metals. SainSmart's manual says it cannot cut clear acrylic, and as a diode it cannot cut blue acrylic or metal; the 0.05 mm stainless claim means foil only. Never laser PVC or vinyl.Better alternative if
if you want autofocus, 40W of power and a more established software ecosystem and can spend about $1,000 more: xTool S1 40WScores
Scored on the same scale for every laser on this site. See all lasers ranked.
Specifications
| Laser type | Diode laser |
|---|---|
| Form | Enclosed |
| Optical power | 20 W |
| Other modules | 40W version sold separately ($1,199), and a 40W upgrade module for the L8 |
| Wavelength | 455 nm |
| Work area | 400 × 400 mm |
| Max speed | 40,000 mm/min (about 667 mm/s) |
| Cutting (maker claim) | 15 mm basswood plywood in one pass (maker claim, not tied to 20W or 40W; likely the 40W figure) |
| Precision | 0.01 mm (maker claim) |
| Air assist | Included |
| Camera | Yes |
| Autofocus | No |
| Rotary support | Yes |
| Safety | Class 1 enclosure with door sensor, flame sensor, tilt protection, emergency stop and key switch |
| Connectivity | USB, Wi-Fi, TF card |
| Software | LightBurn, LaserGRBL, CutLabX |
| Weight | not published |
| Price | from $699 at SainSmart, checked Oct 2 |
Pros and cons
Why we like it
- Class 1 enclosure with door interlock, flame sensor, tilt stop, e-stop and key switch
- Ships pre-assembled with air pump, honeycomb and a LightBurn-compatible camera
- 40,000 mm/min rated speed is fast for a diode
- Full 400 x 400 mm bed inside the enclosure on the 20W
- Wi-Fi and USB-C, with the free CutLabX app or LightBurn
Watch out for
- Manual focus with gauge blocks; one owner found the supplied gauges did not match the manual
- No published machine weight, and the box is a large 715 x 621 mm
- The 40W version costs $500 more
- The store page still lists the rotary rollers and air purifier as coming soon, so check availability first
- Like any diode it cannot cut clear or blue acrylic or metal
Compare with
Frequently asked questions
What materials can the SainSmart Genmitsu L8 20W cut and engrave?
Cuts plywood, basswood, cardboard, leather, felt, fabric and dark opaque acrylic. Engraves wood, leather, stone, ceramics, stainless steel and coated metals. SainSmart's manual says it cannot cut clear acrylic, and as a diode it cannot cut blue acrylic or metal; the 0.05 mm stainless claim means foil only. Never laser PVC or vinyl.
What else do I need to buy with the SainSmart Genmitsu L8 20W?
Venting the exhaust out a window or SainSmart's optional air purifier, a rotary roller for cylinders, a fire extinguisher, and a LightBurn licence if you want the camera workflow (CutLabX is free)
How much does the SainSmart Genmitsu L8 20W cost?
From $699 at sainsmart, 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
- SainSmart official store: Genmitsu L8 product page
- SainSmart official store: Genmitsu L8 product JSON (prices)
- SainSmart: Genmitsu L8 user manual (PDF)
- SainSmart docs: Genmitsu L8 resources
- LightBurn forum: Genmitsu L8 cutting depth and focus gauges