One of the storage boxes I purchased for storing my MTG cards came with a couple nifty plastic dividers. That was way back before 3D printing was even a thing. Now that we have the ability to make our own stuff, I have made a dozen more dividers to better organize my Magic cards. Also useful to separate your main deck from your tokens and sideboard in your deck boxes.
Print at 0.2 or 0.25 layer height in the color of your choice and you're good to go!
The author marked this model as their own original creation.