Pen mechanism representation toy

thingiverse

This is a model that represents the functionality of a common retractable pen. It has "windows" in the body that allow you to see the interactions between the parts of the mechanism. It can also serve as a cool clicky fidget toy. Note that you need a ~8mm diameter spring for this project. I took mine from an airsoft speedloader. I realised that there were no separate files for two parts, so I uploaded them.