PIXMA MX870 Only Shows Up as Scanner
iMac, OS X Mavericks (10.9.1), 21.5 inch Mid 2010 i3 iMac
iMac, OS X Mavericks (10.9.1), 21.5 inch Mid 2010 i3 iMac
The printer component of the MX870 uses a Canon proprietary protocol called canonijnetwork to advertise the printer on the network. This protocol is included with the MX870 driver. This protocol can take longer than Bonjour to advertise the printer, some times up to 15 seconds longer. So if you have this add printer window open and a second MX870 does not appear after 30 seconds, then try turning off the MX870 and unplugging the power cord for several minutes. While it is off, restart your Mac and then power the MX870 back on. See if this now makes the printer component appear.
If this action does not help, then download and install the MX870 printer driver.
Restarting seemed to do the trick
PIXMA MX870 Only Shows Up as Scanner