This is kind of neat, but the rigidity is questionable. It's significant that they only show sped-up video. You don't get to see the actual cutting speed. I suspect they have a really low feed rate because they can't exert significant side loads on the router. Maybe if they had four chains, so it wasn't just gravity holding the thing in place... Wallboard, yes, MDF, probably, plywood, if thin, hardwood, no.
A big problem is that this thing gets its Z position by riding on the material it is cutting. So you have to cut things out of fresh big sheets. If you cut away too much, work near the edges, or use smaller sheet stock, there's going to be trouble. For decorative scrollwork in thin stock, though, it could be useful. Expect stuff from this machine to appear on Etsy shortly.
I've used ShopBots for similar work. Those have enough rigidity for wood, even hardwood. The limitation on cutting speed is damage to the router bit; the machine has plenty of feed power.
My own drivetrain for something like this was simply a small gear on the shaft of a stepper running on a long piece of gear rod. Accuracy was more than acceptable and you could reach very high speeds with the appropriate acceleration curves (very important too to minimize step-loss chances).
A big problem is that this thing gets its Z position by riding on the material it is cutting. So you have to cut things out of fresh big sheets. If you cut away too much, work near the edges, or use smaller sheet stock, there's going to be trouble. For decorative scrollwork in thin stock, though, it could be useful. Expect stuff from this machine to appear on Etsy shortly.
I've used ShopBots for similar work. Those have enough rigidity for wood, even hardwood. The limitation on cutting speed is damage to the router bit; the machine has plenty of feed power.