Best approach for modeling a compliant (living) hinge for 3D printing?

Hi everyone,

I'm working on a project for a small, 3D-printed enclosure that needs an integrated lid. I'm trying to design a compliant, or 'living,' hinge directly into the model rather than using a separate mechanical hinge.

I've been experimenting in Fusion 360 and have tried a few approaches:

A simple, thin bridge section between the lid and the base.

A series of smaller, interlocking segments.

The first method snaps after a few uses, and the second is very stiff. I'm printing in PLA on an FDM printer.

My specific questions are:

What is the most effective geometry/profile for a 3D-printed living hinge (e.g., a 'V' shape, a 'U' shape, a specific curvature)?

Is there a rule of thumb for the wall thickness and gap distance relative to the overall wall thickness of the part?

Does print orientation (e.g., having the hinge layers parallel or perpendicular to the bend ) make a critical difference?

I found a few models on Grab Cad, like , but I'm struggling to adapt the principles to my specific geometry.

Any guidance, recommended resources, or a point to a helpful tutorial would be greatly appreciated. Thanks in advance for sharing your expertise!"