This is an extra compartment for your Ekster Aluminium Cardholder.
You can use it to store some coins or other small items like SD cards.
There are two sizes included. One with the inner storage compartment height of 2.5mm and one with 5mm.
Print with support on the build plate.
(The surface part that needs support will be hidden by the silicone/elastic band)
If you just need a replacement for the original backplate, check here.
The author marked this model as their own original creation.