Futurola Knockbox 300 Pre-Roll Cone Filling Machine, Slender Filling KitThe Knockbox 3 300 Cone Filling Machine is a must have for all commercial opertaions. Fill 300 pre rolls in 90 seconds This beast has 3x the capacity as the original Knockbox 100 with a rate of 300 pre rolls in 90 seconds! The Futurola Knockbox 3 is compatible with more than 16 varieties of Futurola (and other brand) pre rolled cones that range in size from . 5 gram pre rolled cones up to 2 gram pre rolled cones. Futurola has developed the Knockbox 3