Y splitter remix

Inspired by @cv6Channel. I need to use side spool for my X1C, but the design shared by @cv6Channel can't fit. So, I decide to design my own version. Two versions are provided for using PC4-M6 and PC4-M10x0.9 pneumatic connectors. It is highly recommended to use connectors that PTFE tube can go pass all the way through it. That means PC4-M10x0.9 or PC4-M6-4x4, but not PC4-M6-4x2. This will get rid of any unnecessary friction inside the pneumatic connectors. If you only have PC4-M6-4x2 on hand