No problems printing file.
Very baffling to watch.
This is easily my favorite module. I have it sitting as the first module in the 2Wheel base so it collects 4 balls then runs them down at once. Everyone seems to enjoy watching the balls chase each other down the track. For extra fun, stop the balls 1/3 down the track with your finger and let them back up till you get a dozen or more in a line. Then remove your finger and watch them all race down the track.
Really like this module, its great to see the marbles go through the maze. I do wonder if the module can be optimized a bit to use less fillament.