3d printed toy windup car

This is a 3d printed toy windup car project that I could not get to work. Grandad did the same project and after many hours finally did get his to run right. I knew starting out that I was probably never going to get mine to function but I liked the look of the toy. I used the project as a 3d printing learning tool. That part of the prioect was a success and I learned a few new tricks.
Here is Grandad’s 1st video on this 3d print project. https://www.youtube.com/watch?v=Ge5Mg7ciG7k&t=621s

Here are theThingiverse print files posted by brico3D in 2016. https://www.thingiverse.com/thing:1848663

Here is the 6th video Grandad posted on this project where the car actually ran perfectly for a long distance. Fast forward to 11 minutes to see it run. https://www.youtube.com/watch?v=_97PPFtCwOw&list=PLA5a2xPRSrB1D-93lQxyjysBGrhqkQn52

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