Stacking Block Toy Train MK3

This is more a "homage" than a direct remix of Caj's inspirational Pull Toy Train.Update:After extensive field testing (thank you Harper, Cora, and Brenna) I discovered that when a child puts their weight on the car this puts stress perfectly in line with both the printed layers and the weakest area of the axle and causes it to break. This appears to be the primary failure mechanism and results in either threaded stubs stuck in the wheels--or worse--a small chunk of free plastic just