Threaded PTFE-y-splitter fully printable

Another PTFE-y-splitter but with treaded caps that tightly secure the PTFE tube without the need of pneumatic connectors.

This is an upgrade to my previous Y splitter (https://makerworld.com/en/my/models/484122/edit). The previous version still was a bit akward to install so I added twistable caps that thread into the PTFE tube. The twistable caps make it easier to install in hard-to-reach places like behind the printer.

Additionally, it prints faster, and this design made it possible to add a 4 to one splitter.

THE WIRE WILL SLIGHTLY BITE INTO THE PTFE TUBE AND LEAVE A MARK.

From experience, it is best to use PETG, ABS, or ASA. (I do not know how, but with PLA, I have had the filament fuse with the connector one time, hence, I wanted a removable solution :)