This is an improved version of the predecessor, Omamori version 4, with the total weight around 313g.
Please see version 4 for more information:
https://www.printables.com/model/807902-omamori-wearable-hepa-version-4
Additional parts:
1. Centrifugal fan:
https://www.amazon.ca/dp/B07TTB2T71?psc=1&ref=ppx_yo2ov_dt_b_product_details
2. Battery:
https://www.amazon.ca/gp/product/B0BQQWZ25G/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
3. M3 screw (40mm):
https://www.amazon.ca/gp/product/B0BW881KKR/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
4. M3 nut:
https://www.amazon.ca/gp/product/B07MD7SPBJ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
5. MT3608 module:
https://www.amazon.ca/gp/product/B07RNBJK5F/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
The author marked this model as their own original creation.