Universal bolt

So I saw this double threaded screw design and I wanted a slightly bigger, clearly labeled version for educational purposes.

Should fit easily after printing. Be sure to reduce outer wall speed to 20 mm/s or so to maintain dimension accuracy.

How I designed this:

I used Fusion 360 to make a right handed threaded rod. Then mirror the rod on top of itself as a new body, but this is now left handed thread due to the mirror.

Followed by a intersect command to keep the volume of the two threads which are common.

This thread now accepts both left handed and right handed threads.