On the size of your butcher paper, this might work for you like i do it in the bodyshop. We have rolls of sandpaper and masking paper mounted on the wall and pass the "tail" behind a hacksaw blade that is fastened to the wall at both ends below the paper roll. We have marks running down the wall below the blade for different lengths. We pull the paper down to the mark we want and tear it off. The hacksaw blade work perfectly.
There's Room For All Of God's Creatures!!! Right Next To The Mashed Potatoes!!!