You can set the tube height to like 4mm and that's pretty much what you'll get.
The tubes only need to be tall enough for a "window" at the bottom and a splitter in the middle so that plastic will flow up one side and down the other.
The window height calculations are automatic right now. To make sure the window area is as large as the tubes so it doesn't create a bottleneck that stops flow.
But if you print tiny tubes with a tiny nozzle you could probably get the tube height down to ~3mm.
There's binaries if you want to play with the settings and see it for yourself
The tubes only need to be tall enough for a "window" at the bottom and a splitter in the middle so that plastic will flow up one side and down the other.
The window height calculations are automatic right now. To make sure the window area is as large as the tubes so it doesn't create a bottleneck that stops flow.
But if you print tiny tubes with a tiny nozzle you could probably get the tube height down to ~3mm.
There's binaries if you want to play with the settings and see it for yourself