Excited by the challenge of building a Backyard Roller Coaster ... [Will] is now working on mark II of the cart made from a steel frame with skateboard wheels and has independent axles.

[Jon Mendenhall] fixed this deficiency by designing a model roller coaster that accurately simulates a full-sized ride. The track and cart are all made of 3D printed pieces, which altogether took ...

Of course, Miller's advance did nothing to mute the roller-coaster experience. On the contrary, where the side-friction wheel had limited velocity and the depth of the plunge, the under-friction ...