A removable HDD frame for backup hard disks. My USB hard drive adapter is only occasionally reliable, so I wanted a SATA solution for my PC. I designed the adapter around this SATA + power extension cable with fixation holes (like this). Something similar will be available in your area.
The switch and power LED are optional. The switch operates both 5V and 12V.

I printed the parts on a Creality K1 (frame) and Anycubic MEGA S, Kobra Neo and Creality K1 (holders).