Note: You cannot use the digital files to manufacture these parts; Some details on the 3d models have been removed,and some walls is too thin; That means if you 3d print these parts, they won't work. But you can use the 3d model to design other parts; it is a diy craft kit to help make some interesting product.And you can modify the 3d models too.Ignore the stl , obj and fbx format files, they are only used to meet the platform's requirement.More about the mechanism:https://www.tanerxun.com/push-to-release-mechanism-design-plan/.html