For me, using a knife is a two-handed job. I use the Knife Assistant to provide a flat surface on the back of almost any knife to push against it more comfortably. It also keeps the knife more controllably vertically aligned for nice straight slices.Want me to design a 3D printable assistive technology for you? Contact me!Rafts: NoSupports: NoInfill: Solid or nearly solid so that it is strongUpdated 6/20/12: Knife Assistant (Repaired).stl is cleaned up a little and should print better on more finicky machines.Slip on to back of knife near handle. Hold knife handle firmly and push straight down on Knife Assistant to chop easily through most vegetables.This is scaled for larger knives. For smaller knives, try scaling it down a little. Always be sure your print is solid and strong before trying it on a knife!Knife Assistant may slide depending on size of blade and scale of print. Be careful!Never use the Knife Assistant on or near the sharp end of the knife. It may slip off and cause injury!Never put on sharp side of blade. Only put on back as pictured.