Love the original model https://www.printables.com/model/325995-foldable-ruler-credit-card-size but had trouble printing. The original has 0.2 clearance for the hinge which has worked well for some, but my slicer was trying to print the hinge transition layer midair which caused the hinge to fuse. I added an additional 0.3 mm clearance and now it prints well for me. I am including two files. The first is a test print that has the original and my modified hinges so you can print and see which one you like best. The modified may not be as strong as the original.

In the test file, the one with the “9” is the original and the one with the “3” has the additioinal clearance.

The second file is the full modified model.

If you want to print the original version, here is the link:

https://www.printables.com/model/325995-foldable-ruler-credit-card-size

I recommend printing in PETG of the additional flexibility.

Thanks to @SD3D for such a great useful model.

God bless,

Casey Bowie