Hollowed out the joiner tube as per comments from Barry and Yodanoob who pointed out that there is no way for the pressure to equalize within the length of the tube. No equalization, no water movement, no self leveling. Silly oversight on my part, thanks for the recommendations!
Added version 3, sort of a small rework - smaller frame, but using the same OD tube as before. Changed the folding mechanism a little bit. I don't actually wear glasses and I'm about 10,000km from my printer right now, so y'all gonna have to print it out and resize as needed. Or drop a note in the comments with your recommendations!
Who knows if this even works. You're gonna need some clear tube, 8mm OD x 5mm ID. Fill It with colored water and plug the ends with the the tube joiner stl. Put all the tubes in the frames. Cut off a bit of filament and insert into holes for the arm hinges, then warm up each end and squish it against something to terminate the ends so that they won't fall out of the hinges.