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Hero7 has the same dimensions as I'm getting from calipers on my Hero6 -- 44.9mm tallhttps://gopro.com/help/articles/question_answer/hero7-weight-and-dimension-information
I originally designed the mount 1mm taller, but the camera kept falling out in crashes. It's meant to be a tight fit, printed in TPU with some flex. Double check your scaling settings?