Hi Dronus,
Have a look at my profile page, I posted photo's in an album of a filter I made, loosely based on Aksnis design but I think a little better, cost me under 20 bucks, took an afternoon to make and then later, a bit of time to paint. I had built one earlier and used it, after a few weeks I cut it in half to see how it was working, no oil in the outlet chamber whatsoever, I still had enough tube to make another and I know it works.