A small mechanism that can be used as DIY craft. Some parts are used from ABS. The 3d model can help you to design your other parts,but it cannot be used to make workable parts,because some details are too small,so we remove some details. A spring is inside the mechanism. The sroke is 39 mm. Ignore FBX and OBJ format files.More: https://www.tanerxun.com/product/push-to-release-retract-mechanism-kit-type-2