This is a remake of Debren27's awesome model:
https://www.printables.com/model/304326-bambu-build-plate-holder-with-2-8-tapered-slots-op
I completely redrew it, but all dimensions except for the width to hold more build plates of course and the thickness of the tongue, are the same.
I increased the tongue thickness from 1.6mm to 2mm so it fits more snug under the Eibos Polyphemus Filament dryer.
You will need a printer with a big print bed (at least 311mm when you print diagonally).
This version has the hexa-grid drawn in.
No need to play with infill and layer heights. Just print..
(Will take some time though.)
The author remixed this model.
Loved the design from this creator!!
But.. had more space and more build plates, so I made a 14 build plate version of this model.