This is a Multiple Tube Splitter for Bambu Lab A1 and A1 Mini with AMS Lite.
Just insert the 4 PTFE into the splitter. You dont need an extra PTFE extension underneath to the genuine hub. The filament at the two slots behind of it (Slot 3&4) are directly connected to the hub. Just push carefully the PTFE's into the splitter until it stops.
The 2 slots at the backside fits for 2 extra external spools.
Its a very useful splitter to keep the PTFE stable at printing and stop the wearout of push-in and push-out the tubes.
Use a wide brim to stabilize the object and decrease printing speed.
You can use AMS to print the bambulab logo. Remeber it increase the printing time. Optional you can print the logo separately.
Enjoy !