Epson 3620 vs 3640 I get paid every so often. Then I have to clean up the heat at the printer. I might get more than 100 pages before the ink runs out. One thing to keep in mind is that if you don't set the printer to only print in black and white, the colour cartridges seem to be used to print what looks like black and white. I think the point is to make black people more black or something like that. It might just be a waste of colour ink. In any case, I've started to buy third-party ink from Amazon. I got two black XL cartridges and a set of colour XL cartridges for less than $14, and so far it's been good. When the ink runs out, the cartridge is cheap enough that you don't have to use every last drop. My wife was a teacher, and because the school's printers broke down a lot, she had to print 100 pages for her students every day. Since this printer is so powerful, we would reset the low for days before it actually ran out. It comes with standard-capacity Black (T252120), Cyan (T252220), Magenta (T252320), and Yellow (T252320) ink cartridges (T252420). On the other hand, high-capacity inks will let you make more copies (when you reorder).It's 18 "wide. The depth depends on whether or not you include the paper output tray and the back input tray. When everything is broken, it's just under 17 "a depth When the front output tray is all the way out, it's 22 inches long ".. It's about 25 inches long when the front output tray is out and paper is fed in from the back ".. It stands about 9.5" tall with the lid closed, and just over 19" tall with the lid open.As we've already said, the ADF automatically makes copies on both sides (provided you have it set to do that.) For me, it works well with most copy paper and bond paper. In the past, glossy magazine paper has given me trouble. If the paper is too thin or too thick, it won't fit through the scanner. Instead, you'll have to scan it by hand on the flatbed. Even "perfect" coated paper can jam and need to be done again. On the flatbed, thick items like the covers of some journals must also be scanned by hand. It can print from any device, at any time, including iPad, iPhone, tablets, and smartphones. It has wireless and Wi-Fi Direct. Epson says that if you want to print well, you should only use original Epson inks. If you use inks that aren't made by Epson or that weren't made for your printer, they could cause damage that isn't covered by the Epson guarantee. The WorkForce WF-3640 is powered by PrecisionCore, which gives it better performance than laser. The largest copy size is 8.5" x 14". (PC-free). Automatic printing, copying, scanning, and faxing on both sides, as well as a 35-page Auto Document Feeder that can hold up to 35 pages, are some of the other features. Epson says that if you want to print well, you should only use original Epson inks. If you use inks that aren't made by Epson or that weren't made for your printer, they could cause damage that isn't covered by the Epson guarantee. Save time with 19 ISO ppm (black) and 10 ISO ppm (colour) print speeds (color). You could save up to 40 percent compared to colour laser printing. Powered by Precision Core, the WorkForce WF-3620 gives you performance that goes beyond laser.