Here is a simple solution for a qutatto splitter at the Bambulab X1 and P1. This holder works in combination with the original Bambu Lab A1 AMS hub (only costs $6/€7) and makes this splitter usable for the Bambulab X1 and P1.
BambuLab A1 AMS Lite Filament Hub
EU: https://eu.store.bambulab.com/products/ams-lite-filament-hub
US: https://us.store.bambulab.com/products/ams-lite-filament-hub
UK: https://uk.store.bambulab.com/products/ams-lite-filament-hub