The double cone object rolls UP the ramp due to their physical properties. To learn how this works, watch my YouTube video explaining everything here as I designed this for that video :) Please heart this design if you like it as it helps out a ton! Hope you enjoy watching!
https://www.youtube.com/watch?v=zLFxFGNVJI4
The video also explains how to set up the demo, what the other object does, and what happens when you connect two ramps together.
I found it best to print at a really high resolution and with 40% infill so it can roll the best.
The author hasn't provided the model origin yet.