Board Thread:Questions and Answers/@comment-86.167.247.181-20130217123152/@comment-82.70.109.142-20130313174829

I had this problem and there is 2 things that might be the problem: 1 - you need to supply the wire with a redstone current so it glows up and the filter will look slightly different, 2 - the filter might be in the wrong way around (I found that I had to dig underneath the structure and place from there because if you place it from the top the input is at the top and the output is at the bottom).