Bi-Directional Threads
thingiverse
After watching Олег Певцов's YouTube video below I had to try printing this. The bolt is threaded in both directions, meaning that a left handed nut (included) and a right handed nut (included) can both thread onto the same teeth. Action on the threads is buttery smooth in both directions. https://youtu.be/cDfMI5ahbJI
Download Model from thingiverse
With this file you will be able to print Bi-Directional Threads with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Bi-Directional Threads.