SD Cube V2

https://youtu.be/7rTeFtw_IXA
This is a revised design of my original SD cube
https://www.thingiverse.com/thing:2581513

In this version I considered SirMichael74's comments and aimed to resolve issues related to tolerances, to improve functionality and simplify assembly.
The Original SD Cube is a 3 year old design using Autodesk 123D design . As a concept it was satisfactory, however there is always room for improvement.

With this version I tried to address the following:
1 The pivot pin for the locking arm was too small and could shear off. This is now larger and significantly stronger.
2 The features used to allign and register a shelf to the next could be problematic. These have been changed to tapered slots with better tollerances.
3 The SD card had to be inserted in a certain orientation, inserting the card differently interfered with the locking arm functionality. The SD card can now be inserted in any orientation without obstructing arm movement.
4 The assembly pro