I needed a three way connector for my X1C when using the AMS, an external spoolholder and a Filament drybox. This is the design I came up with.
For external parts you need 4x PC4m10 bowden tube connector. Make sure you have the connectors where you can put the ptfe all the way through the hole. The PTFE has to be inserted all the way into the model, otherwise it won't work!
The AMS should go to the middle connector for less resistance.
If you want to mount the splitter to the printer, you can print out the mounting bracket in the files
You have to replace the original M3 screw with a longer 6mm M3.
The author marked this model as their own original creation.