Originally Posted by katier825
Sounds like you could use something on the underside of the ruler to keep it from slipping. There are a few different things you can do/get. I have clear non-slip dots on mine. They sell a roll of stuff, i forget the name, that you can put underneath. I think it's like a cling or contact paper. I'm sure someone here can come up with the name. I've also heard you can put a few dots of clear nail polish, but haven't tried that one myself. Small pieces of adhesive backed sandpaper can help. I didn't like that though, mine peeled off.
You can also run a line of hot glue around the edges. But suspect you might be pushing the rotary cutter against the ruler too hard. Try to hold the ruler more exactly vertical so you can just use the ruler for a guide. And keep you little finger off the ruler to the left side (if you're right handed) and it will help stabilize the ruler.