Mercer Culinary Millennia Nakiri Knife Guard (8in x 2in)
Mercer Culinary Millennia
Nakiri Knife Guard (8in x 2in)
Fits any knife around 8in by 2in.
I printed with the diagonal slant at the top and the flat end on the bottom (the guard being vertical).
You can make the gap narrower if you want a tighter friction fit.