OSX iPrint to Konica Minolta Printer in Grayscale

install iPrint client
download the konica minolta drives from the website.
I had to use the Linux drivers.

once the drivers are uploaded to the iprint server you can assign the driver to the printer.

Now install the printer on your mac through iPrint.

Now to setup grayscale printing you must manually change the settings on each osx manchine by using cups.
goto:
http://127.0.0.1:631/admin on the osx machine

Click on > Manage Printers > Set Printer Options
change the following settings:

Select Colour to Gray scale.

click on apply settings

You will get some warning messages

# RGB Source(Text)
# RGB Source(Photo)
# RGB Source(Graphic)

set all of these to None

Now is also a good time to set the Papersize to the correct setting.

Apply settings