Knife sheath

My wife loves to buy these 3 pack multi color knifes, either Wiltshire or cheapy brand from Reject shop becuase they have sheaths.My children love to loose the sheaths.This is a remix of one found on thingyverse, using a ruler, i simply measured the approx length/width/depth of the knife and adjust in the slicer scaling by turning off Uniform scale, few trial and errors and this is probably the best fit i had, its not tight to get in, but stays on without being too loose. This may vary by knife,