Filament bending test
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Brittle filaments will break if they are bended (mostly CF filaments). With this tool, we can have measurable value.
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Brittle filaments will break inside those teflon tubes if they are bended too much. With this equipment, we can have measured numbers.
This tester will be regularly used on the MyTechFun channel (with brittle filaments).
If you add a color change from 5.2mm, you can have the scale in different color. No supports needed, I printed mine with 3 walls and 30% infill.
Update: After so many testings, I have enough experience to make this scale:
If the breaking angle (X = BREAK - START) is
X<=45° Very brittle filament, big chance that it will break in H2S, Q2, K1 Max printers
45< X <= 55° Moderately brittle
55< X <= 65° Low brittleness
X > 65° Not brittle
Just a short example (from 2:12):