On most Epson (and many non-espon) printers, most body sensors are “flip lever” sensors. That means that you can pretty much stick a pencil or folded piece of paper in any sensor-area of the printer to trick it into printing when some part of the printer is open or missing. This is true for things like the ink-bay-covers, the front-cover, top-covers, etc. This is always useful when debugging a printer.
*This was on my mind today because I’m working on building an alternative process (specifically palladium/platinum) negative profiling system and I often need to look into the printer to see how it’s laying down ink live. This little head-cleaning swab tool works pretty great (above in white).