The Theory of Building Blocks

Thank you for watching. This is an explanation of a modular toy system of building blocks. It is designed and made for my nieces and nephews but released to the public for their entertainment. Feedback in the comments would be greatly appreciated. More videos on the project to follow.
Constructed of 3D printed blocks, plastic nuts & bolts and MDF planks it's purpose is to bring theories off the page or screen and into a real experience. Files and a pamphlet can be found at:

https://www.printables.com/model/600792-building-blocks-repeating-catapult

The safety of the parts or designs cannot be guaranteed and are released for entertainment purposes only.

I used hardware from McMaster-Carr.
https://www.mcmaster.com/99091A542/