About this 3D model

Just a simple puzzle I made that I thought I'd share with you guys. Print three of part 3, one of part 1 and one of part 2. You'll need a small screw and a screw driver with a small shaft to assemble. Here's how you do it: https://www.youtube.com/watch?v=umXWcxtxX-E Requires one small screw (preferably no longer then 7 or 8 mm) and a fraction of a spring