wood track magnet duplo train updated

Original model is not smooth. It contains a lot of planes so I've update code and add possibility to scale nipple count.

1.6.18 EDIT - Wheel width reduced, car body updated.

27.9.18 - Version V2 where is used thumbtack as axle for wheel instead of printed one. This ensure better performance cause printed axle was damaged by my child... Thumbtack is just pressed into plastic. Use magnet 10x3 mm with hole. you can buy some everywhere.