Made it for the Ender 3 but may work on other printers with 2020/2040 Aluminum Extrusion. This is a holder for the Micro SD to SD card adapter. Micro SD TO SD Card Extension Cable Adapter Flexible Extender SD/RS-MMC/SDHC/MMC for Monoprice Select Mini 3D Printer/Anet A8 3D Printer/Raspberry Pi/GPS/TV https://www.amazon.com/gp/product/B01D9JIUU0/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1.
It is cheaper of E-Bay or Aliexpress.com if you want to wait for it.
You can mount it in several places to your requirements. I have made several versions. Please note that if you mount it under the 2040 it may not fit. It fits mine because I bought some rubber feet for my Ender 3 and it has a little more clearance.
The holder has one screw hole that can be locked into place with a small M3 or M4 screw and hammer nut. You do not need to but I added Velcro tape to hold the ribbon cable down on mine. Double sided tape will work as well.
Added 3 with a SD storage tray/box. These will only fit the left side of the printer.
Let me know if you have any questions or comments.
I have a good part cooler on my printer so I did not need support. Stock cooler may need support. Higher infill will make part stronger.