This organizer doesn't store any gear cards. I have my gear cards in a 3-ring binder. You might be able to print extra gear trays and use those with the included dividers. 
This organizer requires the Core Box, GCE Box, and any recent expansion box to fit everything.
The below list is how many of each STL you should print.

Update 5:
-Added Pillars lid. (Uses Small Tray)
-Added Parasite Queen lid. (Uses Large Tray)
-Added Screaming God lid. (Uses XL Tray)

Update 4:
-Added missing core game trays.

Update 3:
-Added Pariah lid. (Uses Large tray)
-Added Red Witch Braal lid. (Uses Small tray)
-Added Red Witch Nico lid. (Uses Small tray)
-Added Red Witch Seer lid. (Uses Small tray)
-Added Philosophy Small Tray.

Update 2:
-Added frogdog lid. (Uses XL tray)
-Updated strange resources lid to XL size. (Uses XL tray)

Update 1:
-Added black knight lid. (Uses small tray)
-Added black knight terrain tray. (This is for the small terrain pieces)

Survivor Base Rings:
Base Survivor x 4

Lids:
Print 1 of each lid. They are sorted by tray size.

Trays:
Tray Small x 34
Tray Large x 13
Tray XL x 6
Tray Books and Events x 1
Tray Philosophy x 2
Tray Philosophy Small x 1
Tray Settlement Gear x 3 (You can print more of these to store more gear.)
Tray Settlement Long x 1
Tray Settlement Philosophy x 1
Tray Settlement Short x 1
Tray Storage x 2
Tray Black Knight Terrain x 1

Core Trays:
kd-tray-core-large-a x 1
kd-tray-core-large-b x 1
kd-tray-core-large-plate x 1
kd-tray-settlement-events x 1
kd-tray-terrain-core-a x 2
kd-tray-terrain-core-b x 2
kd-tray-terrain-core-plate x 1
kd-tray-terrain-core-small x 1
kd-tray-tokens-extra x 1
kd-tray-tokens-loose x 1
kd-tray-tokens-organized x 1
kd-tray-core-extra x 1

Core Tray Terrain Assembly Pattern:
AB
BA

The plates for each assembly are glued centered, on top of the connections to provide reinforcement.