Deck holders: Firefly the Board Game

While there are several great deck holders available, unfortunately they didn't work so great for the cards when they had a card slip over them. I also wanted to practice with Fusion 360, so I made this design. Considering that this is my third design, I think it came out pretty decent.
I still have a lot to learn, so I welcome some suggestions for improvements.

Note: I am using the Robo R1 +, unfortunately they don't have that option yet.

Update 2/12/2016: I have uploaded three versions of the card holder.
Version one is basically my original design. It takes a bit more time and filament than the other two designs, but is fairly certain to print nicely. It also should require no supports.

Version 2 has the sides thinned out to cut back on filament and time printing. It only offers a minor improvement for both over version 1. No supports should be needed, though the side parts can wobble a bit during printing.

Version 3 is the most efficient as far as filament and time, but may print best with some supports.

I have included a Fusion 3D export file, just let me know if you need some other file format. I would also welcome some input on which design works the best. Thank you, and have a great day. :-)