Dual Extrusion Y Splitter For 4mm Bowden Coupling and 1.75mm Filament

Haven't tried it yet, but I couldn't find a Y splitter that would work with my 4mm Bowden connectors.

No PTFE inserts because I'm hoping I won't need it. I'm going to use transparent PETG for mine so I can see what's happening inside, not sure what plastic will work best.

Use a tighter tolerance PTFE tube for the run from the hot end to the bottom of the splitter to try to control the plug that will form on retraction.

I'm not using any custom GCODE, I'm using two stepper drivers in a