I agree with welding, when you feed limbs with real small stuff (like alot of leaves)....... break it up and feed it a good sized limb or two in between. Feeding it a larger limb will tend to keep the chute clear since the larger, heavier chips will tend to knock the little stuff out and keep the chute clear. I've never found it to be a huge problem...... but it definitely happens to me, especially with pine needles.