Collapsible Hand Fan

This is a collapsible hand fan where the blades interlock in a way that they can't over extend or pass through their collapsed state. 

Warning: 

People seem to have some issues with BambuLab printers with this model. Make sure to have a non-stringy, non-brittle filament and be a bit careful when using the model. It is an ‘expert’ model with tight tolerances, thin walls and small bed adhesion. If this frightens you, please do not print the model or keep it in mind beforehand as a challenge. The issues might also be due to the supplied print profile (although I doubt it), so you might also want to experiment with slicing it yourself.