Square vs hexagonal nuts as 3D printing inserts

Using screw nuts as 3D printing inserts is very useful, gives more strength to 3D printed joints. In my latest projects I started to use square nuts, but I wasn't sure if they are better and what is the difference. In this video I am talking about contact areas and transmitted torque. Also I will talk about different insert types.

Contents:
0:00 In this video
0:15 Introductions
0:52 Bolt-Nut joints
1:37 About pulling force
2:51 About torque
8:10 3D printing insert types
9:00 inserts on surface
10:07 inserts builtin printing
12:07 pocket inserts
13:05 Conclusions

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3D printed objects mentioned in this video can be found in this list:
http://www.mytechfun.com/videos/3dprint

Materials and methods:
Prusa MK3 3D printer, Prusament PLA filament (printed with 4 perimeters and 100% infill), M5 nut, Fusion360 (for 3D objects), QCAD (for 2D drawings), 40kg hanging scale