About this 3D model

This adapter is inserted into the hole of the original spool holder to be able to use LED strip spools with a 13mm hole. Why have I designed it? I use many spools of this type and I have quite a few left over at home, so I decided to rewind the short test filaments that the manufacturers sent me on these small spools. The problem is that no spool holder is suitable for such a small hole, which is why I came up with this shape using the original spool holder as a support. In addition, it can be left inserted since it respects the space that most 1kg spools need. I thought about doing it with a bearing but it's not necessary for something so light.