I made this animation to show the principle behind my one size fits all lock. My previous design had one locked position which worked on my 3d printer, but many others reported the nut would not turn. To fix this I am working on a design that incorporates several "locked" positions. On a really accurate printer the first position may be too loose, but you can easily tick to the next position until getting a tight fit. On a low accuracy printer I am hoping lock position 1 will be loose enough to allow the nut to turn.