Problems with quality on H2C, standard settings

Bambu Lab H2 Series
1

I had a year and a half of bliss with my X1C - quality great on standard settings with bambu PLA filaments. Hundreds of prints of all types. I upgraded to a H2C for size reasons and have been plagued by print quality issues - one of the most common is the deviations in tall vertical walls. But I also get stringing and ripples on supported flat surfaces.

Any help appreciated, thanks.

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Try turning off the chamber cooling. Big difference between a H2C and X1C, active chamber temperature management. X1C you just opened the door and lifted the lid.