Print with ABS or PETG with brim and no support (only touching print bed). You need to rotate the model so that the single entry is at the bottom. Don't use too much force when screwing in the PC4-M6's. Fully push the bowden tubes through the PC4-M6's.
You must use “UNLOAD” when removing the external filament, not manual retract. This will give the filament a clean cut and it will not stuck in the splitter.
See also: https://www.printables.com/de/model/584189-clean-bowden-y-splitter
The author marked this model as their own original creation.