This is my version of the snake puzzle cube. You don't need any glue or or screw to close it. you just need to insert the elastic cord in the "elastic_cord_lock" piece, make a knot, insert it in the "cube c" and turn it of 90°.
Just a dude who loves CAD & 3D printing.
If you like my projects, support me buying the material from my links, it will not cost you extra money and you will allow me to finance new projects! I would really appreciate it!