This article contains the FAQs for using your Series K1100/K3300 Series Ninja™ Foodi™ NeverDull™ Knife Sharpener.
This supports the following product SKUs K12502, K12502C, K31300, K31300B, K31300C, K32502 and K32502C.
For knives used daily, we recommend sharpening at least every 2 weeks to maintain their edges for a NeverDull™ experience. For knives used less often, sharpen as soon as you notice a reduction in cutting performance and/or dull edges. Frequent sharpening will not damage knives.
No, you cannot over sharpen your knives. Frequent sharpening will not damage knives.
If your knives have not been sharpened for an extended period (4 weeks or more), increase the sharpening to 20–30 swipes (more swipes may be needed for severely dull knives), then resume the ordinary maintenance routine (10 swipes at least every 2 weeks).
Move the slider up and down 10 times for each knife. 10 swipes of the slider should restore each knife to optimal sharpness. The slider must travel the full length of the sharpener, regardless of knife size. Even with smaller knives, like the 3.5" Paring Knife and 4.5" Steak Knives, the slider must travel the full length. The upstroke positions the stone sharpening wheel, and the downstroke sharpens the knife. If your knife has not returned to preferred sharpness, repeat sharpening. For more instructions on sharpening, see the Use and Care Guide or "How do I sharpen my knives?" in the FAQs.
No, only sharpen Ninja™ knives in the Ninja™ Foodi™ NeverDull™ Knife Sharpener. The sharpener is designed for Ninja™ straight-edge knives only. Sharpening other branded knives, serrated knives, or shears could damage both the knives and the sharpener. NEVER sharpen a serrated Ninja™ Bread Knife or Ninja™ Kitchen Shears in the Ninja™ Foodi™ NeverDull™ Knife Sharpener.
No, only sharpen Ninja™ knives in the Ninja™ Foodi™ NeverDull™ Knife Sharpener. The sharpener is designed for Ninja™ straight-edge knives only. Sharpening other branded knives, serrated knives, or shears could damage both the knives and the sharpener. NEVER sharpen a serrated Ninja™ Bread Knife or Ninja™ Kitchen Shears in the Ninja™ Foodi™ NeverDull™ Knife Sharpener.
Yes, you can sharpen your Ninja™ Steak Knives in the Ninja™ Foodi™ NeverDull™ Knife Sharpener. It is recommended to sharpen knives at least every 2 weeks to maintain optimal sharpness.
No, only sharpen Ninja™ straight-edge knives in the Ninja™ Foodi™ NeverDull™ Knife Sharpener. Do not sharpen serrated knives. The sharpener is designed for straight-edge Ninja™ knives only. Attempting to sharpen a bread knife could damage both the knife and the sharpener. Bread knives have serrated edges to maintain sharpness.
The slider must travel the full length of the sharpener, regardless of knife size, because the stone sharpening wheel gets repositioned only if the slider reaches the end of the sharpener. It is this full downstroke that sharpens the knife. If the slider does not travel the full length, the stone sharpening wheel can get jammed at the end of the knife, which may prevent sharpening and cause damage to both the sharpener and knife. Travel the full length of the sharpener to sharpen your Ninja™ knives correctly.
A clean Ninja™ knife is inserted all the way in the sharpener once you feel the blade come to a hard stop when firmly pushing straight down. Large-handle knives go in the wide section of the sharpening slot. Small-handle knives go in the narrow section of the sharpening slot. Refer to the enclosed instructions (specifically the Quick Start Guide) for knife insertion diagrams and complete steps.
No, the Ninja™ Foodi™ NeverDull™ Knife Sharpener is manual. You must swipe the slider on the side of the knife sharpener all the way up and down 10 times to sharpen each Ninja™ knife.
More swipes may be needed for severely dull knives. If your Ninja™ knife feels dull after 10 swipes, increase the sharpening to 20–30 swipes, then resume the ordinary maintenance routine (10 swipes at least every 2 weeks).
Make sure you are pushing down and holding the release button while carefully removing your knife. The knife will be held in place while sharpening, and the release button is needed when you are ready to remove the knife from the sharpener. Note: ensure the slider is at the bottom of the sharpener when removing your knife.