In the stackexchange thread they say that 12 pieces makes a circle, so each one is 30 degrees, but they also say that you can fit 13 pieces in a "circle", which

In the stackexchange thread they say that 12 pieces makes a circle, so each one is 30 degrees, but they also say that you can fit 13 pieces in a "circle", which means that each piece has 30-360/13=2.30 degrees tolerance. The maximum gap should then be in theory be around 2-3 mm, if this drawing is accurate: https://www.eurobricks.com/forum/index.php?/forums/topic/193856-duplo-train-track-accessories-printed-in-3d/&do=findComment&comment=3595907 https://www.eurobricks.com/forum/index.php?/forums/topic/193... https://i.servimg.com/u/f13/17/36/35/47/geom110.jpg https://i.servimg.com/u/f13/17/36/35/47/geom110.jpg But in practice due to the interlocking design, see here: https://www.onemetre.net/OtherTopics/Duplo/Track%20dims/DuploTrack.htm https://www.onemetre.net/OtherTopics/Duplo/Track%20dims/Dupl... there won't be any added gap (besides the ones due to the tolerance in the interlock), the pieces will deform along their length making no gaps capable of derailing at the juctions.