I finally got around to creating an insert for Great Western Trail Argentina after quickly realizing that the plastic insert that comes with the game is complete garbage. This makes storage much easier and cleaner.
You need one of each piece except for the player boxes, for those you need to print 3 of the file Player_Box_Cutout_x3.stl and 1 of Player_Box_x1.stl. Supports are needed for the 3 cutout player boxes, all other parts will print without supports.
The card holder and player boxes are designed for sleeved cards, I used Arcane Tinmen MEDIUM matte sleeves that are 57x89mm.
note: this isn't designed to fit the solo player components since I don't play games solo and I leave them outside the box. You can make the solo stuff fit if you unsleeve the cards and put the other components on top of the boards but it would probably lift the box lid slightly.
The author marked this model as their own original creation.