I'm using a cheap projector off BangGood on top of a camera tripod. There's a bit of set-up time every time I want to cut some fabric since I can't mount it to the ceiling but it's still way quicker than printing, taping, and cutting pdf patterns!
This cute raccoon brushed French terry was turned into a Tilly and the Buttons Billie Sweater.
I send my PDFs off to be printed, but I really like this idea. The main difference I might do if I go this route is projecting onto swedish tracing paper instead of directly onto the fabric. I just know my fabric would shift on me with my luck, but I could trace a projection.
I tried looking into the printer/plotter services but sadly it's very expensive in my country, which is why I started on the whole projector adventure in the first place.
Fabric shifting can indeed be an issue. For this stretchy knit I used just two weights but for things that are more slippery, I put weights all over to keep it as flat as possible. Using a rotary cutter also helps a lot.
It's a native 1080p. If you're on Facebook, there's a group called "Projectors for sewing" that has a lot of information, they recommend a min. res of 720p. In the US there's a big market of second hand projectors but it's trickier in Europe, which is why I ordered a cheaper new one (Wanbo T2 Max).