I've basically finished Marble Track 2. I'll probably try to tweak a few points where the balls often jump the track, and I'll add a few "ribs" to the place that failed every time in this vid, but here it is.
Thanks to all who have commented positively on previous vids of this.
marble track 2 after about 2 months of work. It's made completely of wood and glue, primarily popsicle sticks, toothpicks, tongue depressors and ice cream spoons.