The Epson L805 is a standard, low-end, end-user, inkjet printer. It is not capable of CMYK nor does it have a Postscript level 3 RIP. In short, it's nothing overly special and its not designed for use with high-end professional-level software such as Adobe Illustrator. It's a "mom & pop" printer, designed to print things an average user would print - internet pages, emails, Word documents, etc. - Mostly text-based content or random jpg/png images, not vector illustrations.
Without a RIP, your Inkjet printer needs to be sent RGB data. It has no clue what CMYK color data even is. So, if you send CMYK data, the printer doesn't understand it and converts the color to RGB so it can understand.... then it converts it again to CcYyMmK for output. Always send RGB color data if there is no RIP.
Printing directly from Adobe Illustrator requires a Postscript level 3 RIP if you wish the print to be based off the vector data in Illustrator. Without a RIP, Illustrator prints the low-resolution raster preview image, because the printer isn't capable of understanding the postscript vector data.
Considering both items above, printing CMYK artwork from Illustrator will result in a low resolution print after two color conversions --- this often results in unexpectedly poor results.
For best results when printing from Adobe Illustrator using a low-end inkjet printer -- Save your AI file as an RGB PDF, then print the PDF from Acrobat/Reader. Acrobat/PDF is a software RIP and will process the vector data into a high-quality raster preview for printing.