After printing, remove supportings and assemble each hinge with 14 M3×10 screws.

If you want to modify the parts, please download the attached STEP files and edit them in CAD softwares.

The connection structure between the two sides of the hinge may snap after installation due to excessive force applied between layers. 

However, this would usually not influence the functionality of the hinge, as it is mainly held together by the screws.

Reducing the height of middle rods (those don't have a Y shape) by 1~2 layers (0.2~0.4mm) will solve the snapping issue, however, this will potentially make the hinge more shaky.