Fits inside the original box for Star Realms Frontiers, has dividers that I use in this order:

• Authority tracker cards
• Vipers
• Scouts
• Explorers
• Trade deck

The box will not close all the way down as it did originally but it should allow the sleeved cards to be stored sideways for easier access. The dividers should also have enough room to fit an extra set of cards (unsure about the trade deck and untested since I don't have the base game or another expansion)

Loosely based on https://www.thingiverse.com/thing:4789741