I like to be able to take a look at what the printer’s up to remotely. So to that end, I set up a Raspberry Pi with a camera to watch the printer. Having done so, I have some suggestions for those who might want to do so as well.
I went with the Pi Camera NoIr. I did this because I didn’t want a visible light shining constantly on it, but even an IR capable camera doesn’t work in the dark, so I also bought an inexpensive IR illuminator from Amazon. This combination actually works much better than natural light, as it turns out that the orange cover of the Form 3 is transparent to infrared. The lighting illuminates the inside of the printer much better than visible light and gives you a much better view, albeit in false color (everything looks like a sort of lavender/purple color).
Finding a good camera angle is not easy. The best camera angle is slightly above the center of the printer from the front, but that means that the camera is in the way any time you need to interact with the printer. My compromise is off to the side and further up. I bought a wall-mount swivel camera mount from Amazon and printed a small adapter that adapts a tripod mount to the Pi camera (which is held down by 2-56 x 3/16" screws). You can also print a special wrench to allow you to adjust the camera’s focus, as from the factory they focus a bit too far away. That stuff is all available from Thingiverse.
There’s any number of different apps you can load onto the Pi to work the camera. I went for a very simple Python script that just sets up an HTTP server with an MJPEG video stream. Since the Pi is inside the firewall, you have to actually be home (or be VPNed in) to see the picture, but that’s fine with me - I don’t need anything more sophisticated.
This whole set up allows me to spot check the printer and abort gross failures early. I also can see when the wash finishes and even see the faint blue glow from the cure reflected off the back wall.