The first one folding looks okay but for some reason the second half of the dr4b folds completely. Any idea why this happens?
I’m pretty sure it’s because of the gears not being able to be perfectly equal rotations (they need offset by half a tooth) which makes one bar rotated slightly more.
This is due to the teeth of the gears being incorrectly meshed, otherwise the segments would fold at the same rate, and would both fold completely.