Here is a silly little video about how I make sheaths for my kitchen knives. I posted something similar in the past without any voiceover. Here I explain things a bit more.
The reason why I use basswood for the middle piece is to minimize the dulling that might be caused by sheathing and unsheathing the knife, since bass is so soft. Additionally, the good fit mainly comes from the middle piece being the same exact thickness of the knife blade; I can find exact dimensions of basswood for relatively cheap.
Let me know if you have any questions! Also would appreciate any feedback from seasoned woodworkers! #diy source