I've been noticing issues with my memory. Activity monitor shows the 'printtool' process to be taking up a huge chunk of RAM. Right now it's at 800+ MB, for no good reason. (I'm not printing anything.) The process takes up more and more RAM until I kill it. Killing it works temporarily, but it always comes back. I'm looking for a permanent solution.
The parent process is launchd, and this process will run indefinitely until I stop it. I've seen it exceed 1GB of memory before. I've got 4GB in total, Macbook Pro late 2008. I've seen the problem in Snow Leopard as well as in Lion, though it did seem to go away for a while before cropping up again recently.
I had this issue with Lion and Samsung CLX-3170.
On a computer, that was using Snow Leopard and was upgraded to Lion. I.e. it had SL driver v2.0.
I solved it by installing Lion drivers from Samsung v3.01.
After driver installation it showed the driver version still the same (in Print & Scan Preferences pane > printer > Options & Supplies > Driver Version), I had to manually choose the newly installed driver by going to Driver tab, opening Print Using scroll box and selecting the driver once again by choosing Select Printer Software... and searching the driver in the driver list.
Hope this helps.