This is a remix for the original design by CarstenD https://www.thingiverse.com/thing:3048730

Its a nice design for the SD Card mount for Ender 3 but he designed it for uncommon card reader part.

I found that most used card reader is this one: http://s.click.aliexpress.com/e/bByMpv7a

So I tinkered the design to make it usable with the bigger card reader.