My 3D printer has a physical off switch. And it runs Linux - debian - on an embedded ARM board, so I can ssh into the printer etc. (I can even hook up a keyboard and HDMI monitor)

I fear about my filesystem every time I notice the printer is running at night (after a long print job) and I just turn it off without going over to my pc, ssh in and shut down the OS.

Still, it hasn't eaten my filesystem, yet ... ext4 journaling DOES seem to work.