Spacers so your cards don't fall over in storage boxes. Works with bulk storage cardboard boxes and Pokémon ETB (Elite Trainer Box, Top Trainer Box). The spacer clips onto the side of the box, the lid is still closeable (tested with ETB and cardboard box).
Select the variant that fits your box (upright or horizontal).
Variant 2 and 3 allow cards to be stacked besides the spacer on both sides (see fotos) at the cost of less spacer clip stability. Mirroring the model might be useful to you for selecting the stacking orientation.
Modeled from scratch and improved variants created by myself, original inspired by a reddit post.
The author marked this model as their own original creation.