Danish Blocks Doplo Logs (for Train, Trees, etc)

Disclaimer:  These pieces can potentially be a choking hazard to small kids, so please use your best personal judgment before giving them to someone who may be young enough to choke on them.

Using TinkerCAD codeblocks, I have designed a parametric L3go Duplo-like, fully-compatible Log generator.  I used the generator to create an assortment of .STL files you can download below.  It took a few tries to get the studs and anti studs snug enough without being too snug, but after a few trials I ended up with these.  

The 8-block tall models are longer than you need for a train car, but maybe you want to use them for trees?

The 6-block tall are good for the 8 stud long train cars.  They also can be used for trees, etc.

The 4-block tall can work in a train car 6 studs long, but can also be combined with a 1-block tall log piece for even a better fit for such a train car.  

The 1-block tall pieces help make your log slightly longer if needed, but we aware that these pieces are especially small, so do not give them to small children that could choke on them.