I got this when I started selling cut fabrics. I used it on my new 36 inch Omnigrid line and it worked like a charm! I've cut over 100 yards of fabric into 1/4, 1/2, and 1 yard pieces and they've never come off the ruler! If this is not possible, check the suction cups and make sure the small tabs are fully protruding underneath when you put them on. One of mine had a little tongue folded under the suction cup and I had to bend it really hard to get it out of the way but then it sucked great!
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