Ravi Pujar On printing - take a look at this Tutorial post and let me know if you’d like to know more https://www.collaborizm.com/thread/SkEQJA6d-
I agree about off-the-shelf modules being bulky.
But there are options in between the existing modules and printing that will reduce the bulk in near-term products.
Custom modules are one option - these would be tailored to the application in the wearables. They would weigh less and be lower height-wise.
Another option is thin-film modules like the ones from Phononic - see: https://phononic.com/
Let me know if this is helpful, and if you have any other questions.