Shelf that works with A Song of Ice and Fire Tabletop Miniatures Game

I recently got into Song of Ice and Fire miniatures game. Like really into it. Suddenly I have  hundreds of new miniatures to store and display. I made these little shelves to hold them in their unit trays. 

I've reduced the amount of plastic used as I iterate, but this version (v6) still uses about 250grams. I'd like to reduce that further. 

A couple of notes:

• Prints in one piece without supports - lay it so that the big X on the back is on the print bed
• Has rails that hold the trays loosely 
• You can move the shelf (carefully) while it is full
• The trays are meant to stick out from the shelves. I wanted to see as many of the models as I could. Uses less plastic, too. 
• Fits infantry and cavalry trays