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Still no luck. From 3 of them, I notice that they are only bend or twist at the middle bar other part are still in shape. The last one proved that it is not about bed temp because there is only support that touch the bed.

This make me think, it must be from Infill and wall, maybe 50% infill is too much or about it's pattern or both. Next time I will try test print only the bar with different infill and number of wall setting.

And printed in this orientation make the fan support arms very brittle.