About this 3D model

Little housing i created for charging 18650 batteries via a usb module and voltmeter. https://www.amazon.co.uk/gp/product/B07D59NZGW/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1 https://www.amazon.co.uk/gp/product/B07BSVS842/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1 https://www.amazon.co.uk/gp/product/B07T2S628S/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1 although if you plan to make a lot i recommend aliexpress or similar for the parts. the flexible battery holder is NOT my design and all credit for that part goes to https://www.thingiverse.com/thing:456900