The original is a great minimalist storage for two plates. I found it too flexible. It would readily flex outward. Rather than one long central tab there are two tabs closer to the vertical ends. They are offset to avoid the X1c foot and X1c bottom surface bosses.
I chamfered the vertical portions to make it easier to index the plates and slide them in. I added ribs to space the holder away from the printer 5mm for easier finger access.
The author remixed this model.