Xerox 3117 driver for OS X Yosemite
Miroslav

This problem is probably due to kext signing introduced with OS X 10.10 Yosemite. With it you can't run any unsigned drivers and Splix is being a port of Samsung GDI open sourced driver is just a driver and last version being from 2008 it is definitely unsigned.

Basically you have no choice but disable kext signing if you want to use the printer. Make sure you absolutely have to do it and you don't have other options since this change is system wide and system is becoming less secure after that.

In Terminal:

sudo nvram boot-args="kext-dev-mode=1"


And reboot. Then try to go with Splix.