Vít ren hai chiều (Two Way Threaded Screw)

Introduction: This is my version of a screw i saw in a video (not a remix). It comes with three nuts, one for right thread, one for left thread and one for both threads. The screw is not useful as a real screw since the pitch is way too steep, but its a fun toy. 

Print tips: high infill in the nuts for a more satisfying experience