About this 3D model

IMPORTANT I accidentally uploaded a wrong STL for the button. Its now updated! I purchased a 18650 capacity tester from AliExpress. I didn't like the open design, so I created a housing for it. The housing is designed for the 4-channel version. I also added an opening for the fan to ensure that the air has a designated path for improved cooling performance. I added holes at the top for fastening, so that the circuit board can be directly screwed to the housing. I used M3x20mm screws for this purpose. Link for item: https://aliexpress.com/item/1005005444930813.html