Product review (3 stars): NEWS YOU CAN USE!
I think Samsung switched manufacturers and their filters will not screw in without very slightly shaving off some plastic from the leading edge of the largest teeth (one on each side). Previous comments suggest Samsung is denying there is an issue, but myriad comments also affirm that the following fix works. (The best directions include helpful pictures, unlike mine!). I used an exacto knife and shaved off the tiniest slivers from both sides and then it screwed right in with the normal resistance.

I scored it as "It's Okay"  because while after market filters seem to mount without problems, Samsung brand filters are the only ones that meet NSF/ANSI standards 53 and 401 (able to filter out hazardous materials such as Lead/Mercury). The cheaper filters meet only NSF/ANSI 42 which only requires filtering for taste, odor and particulates.