TBH, my elderly Epson Stylus SX218 has always been able to scan & print off without even being connected to a PC. At the time I bought it.....and it must be around 13 yrs old now.....Epson had a 'Copy' function built-in to the printer's onboard software, whereby you lay your document in the scan tray, hit the button and, assuming there's paper present, immediately spits a copy out. So:-
.....computerised photocopying, I guess!
In the intervening years, I've found Epson's own 'ImageScan for Linux' software isn't that consistent. It appears to suffer from a buffer-overflow issue of some kind where half the time it reports that it can't see enough space to function......even when there's terabytes of room.
I find the KDE Project's 'Skanlite' seems to work much more reliably.