Improve your printer!
The power switch on the Prusa MK3 is (understandably) located on the power supply. Convenient for initial construction and minimizing material use. Unfortunately, this is not near the rest of the controls and can be a pain to access if the printer is in a small enclosure or in a corner.
This modification requires rewiring, but, once done, is quite a bit more convenient if you turn the printer off frequently. Particularly useful if you have an enclosure and the PSU is boxed in or has been tucked away somewhere discreet.
This is a modification of Prusa's original part, obtained from their open source repository.