In the spirit of Halloween I have created a collapsible knife prop specifically designed for a SLS printer! The handle of the knife contains the internal spring part and blade stopper, meaning that these pieces can not be taken apart!

The spring should have a 1/3 compression ratio. The entire object is ment to be printed in Nylon PA11 to So that the sping can work effectivly without breaking.

The image attached shows the inner workings of the collapsible knife and is 2 times the size for viewing.

I have also created a FDM printable which I will share!