I saw something on AliExpress to assist in splicing wires, but it didn't look great and was expensive. I thought I could do better.
Simply insert two wires or component leads of similar gauge, one into each side of the tool, align, and solder.
The numbers represent the diameter at the bottom of each channel. The larger three are larger by 1mm at the top, and the smallest larger by just a half.
Wire_Splice.stl | 654.2KB |