Effect of extrusion FLOW RATE to the strength of 3D printed object

In this video I would like to see what is the effect of the extruding flow rate (or extrusion multiplier) to the strength of 3D printed object. The idea came when I did the review of digital microscope and I was analyzing a broken test specimen and I saw those gaps between the printing lines.

Material: 3D Active PLA, max walls (perimeters), 215°C/60°C (additional test with 2 perimeters and 20% infill). Printed on Prusa MK3S

Digital microscope:
On Banggood: https://www.banggood.com/custlink/mKmyBwrJcj
Review video: https://youtu.be/DionUg-NkbY

Check E-steps (from 15:05): https://youtu.be/dvHlawF66Nw?t=905

Download STL of test objects and results as image (for mobile users, so you can zoom in)
https://www.mytechfun.com/video/152

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Contents:
0:00 About flow rate
0:44 Settings in Prusa Slicer
1:03 Settings in Cura
1:18 Introducing the experiment
1:50 About test specimens
3:59 Dimensions and weight
5:46 Under the microscope
6:18 Layer adhesion test
7:25 Tensile test
8:50 Hook test
10:09 Results
12:05 Additional test
13:20 Conclusions

#3dprinting

3d printing3d printing flow rate