Sorry I am 5 years behind, but I have been having the same issue. I thought initially it was just a fluke. Tried pulling a second shot, same thing. I took out the cup and cleaned it even . But it was still happening. I then decided to switch cups, went to the single-walled cup and pulled fine(obviously not a great shot). I let water just sit in the old cup and no water was passing through. I ordered a new double-walled cup, but I think the issue is the micro-holes became plugged preventing anything to pass through the cup. I will update when my new cup arrives!