Okay so I called Tech support and the guy gave me a solution. Go to download page and select pixma mx870, but make sure to change the operating system to the previous one EL CAPITAN instead of the current sierra. Then download drivers both MX870 series CUPS Printer Driver Ver. 11.7.1.0 (OS X), and MX870 series Scanner Driver Ver. 16.1.1a (OS X). Next click software tab and download MP Navigator EX Ver. 3.1.4 (OS X). Install all three applications. Once everything is installed open MP Navigator EX 3.1 found in the canon utilities tab. Once Navigator EX 3.1 is open click on preferences button on the bottom right. Then click where is says product name and click on mx series network (it has to say network) now because you just installed it, the program will give you an error message. After the error message stating it cannot find the network scanner/printer if you are connected to your wifi the correct printer should show and then click ok. (Hope this helps because it worked for me.) If not try calling the tech support line and they can help find a work around.
