I really liked the design by p3t3rp4nd4 to show the tool numbers in the machine directly. But I wanted to print it with multiple colours. After all this is one of the features of the E3D ToolChanger.
I hope you like these files. If you want to change anything I uploaded the F3D and STP files as well.
For threaded inserts I recommend these ones: Threaded Insert M3 x D4.6 x 4.0
As shown by CNC Kitchen these inserts are better than the generic cheap-o ones.
The author remixed this model.