This hinge has a click feel and can hold an angle, can be assembled with snap-fit.

Print settings

• Material: "InnerGearSoft.stl” should be printed with flexible filament. Other parts, PLA, PETG will work fine.
• Layer height: 0.3mm
• Supports: no
• Perimeters: 2
• Infill: 15%

Minimum configuration print parts:

• 1x Arm.stl
• 2x Case.stl
• 1x InnerGearSoft.stl (Should be printed flexible filament print example TPU)

Assembly: 

Put the ”InnerGear" and "Arm" into the case as shown the image. Attaching the other side case. 

If you need stronger angle retention, use "InnerGearHard.stl".