It also has a little more material around the base of the guides and an M3 Nut-trap on both sides of the lever, so you can choose which way to put in the long screw - handy.You may need the use of a hair-drier (30 seconds for PLA) or Hot-air gun for ABS to help it snap-fit into the slot if it's not a straightforward fit.Heating printed objects is always a good trick for many parts that need to bend a little for assembly, especially ABS as it tends to want to break if you force it too hard.