I’ve only been using my laser for a few months, so others on this list will have more experience, but I’ve been having a great time with it. I have no trouble cutting 3mm plywood, though cutting speeds are 1/2 to 1/3 of what I could use with a router. Here is one one post by dkj4linux that outlines his experience cutting 3mm after upgrading to the A40640. While it will be slower, the things you get out of using it (vs. router) are:
- Ability to cut fine detail
- No need to design or cut “dog bones” in square pieces that fit together
- “Finished” edges without worrying about tearout or splintering.
- Ability to label pieces easily
- Assuming your wood is relatively flat, no need for any clamping solution…just toss the wood on the bed.
As for what you will need in addition to a standard MPCNC/LowerRider build:
- A laser mount to attach the laser to your Z axis.
- A piece of sheet metal to protect the spoil board.
- Something to lift the work off the sheet metal (aluminum honeycomb or some other form of mesh).
- Air assist as outlined by Tom. I use an aquarium pump.
- Fume handling as suggested by Tom (optional and depends on your situation).
- I highly recommend the purchase of LightBurn ($60) as the software to drive your laser cutting.
As for setting off a smoke detector, I’m guessing it will depend on the detector. I’d guess it would set off one that uses particulates as a trigger, but it would not set off ones that uses IR unless the detector is poorly placed.
I run my CNC/laser in a well ventilated space but without any form of fume extraction. I don’t find the amount of smoke objectionable, nor the smell objectionable (too many years camping), but I do worry a bit since with plywood, I’m cutting glue as well as the wood, and I have no idea what kinds of chemicals the glue is putting off.
One thing I really like about the laser is how quiet it is. With the router, I confine my cutting to 10:30 am to 5:30 pm due to neighbors and members of my family. I use the laser whenever, including late and night and early in the morning.
Edit: And I wanted to mention, that if you are considering any laser engraving, and if you’ve not yet purchased your electronics, the SKR Pro is a somewhat better choice than the Rambo. If you are just cutting (laser or CNC), then either is just fine.