Box with rails for a sliding lid
- The sliding lid rests on the lower rails and is kept in place by the upper rails.
- When using inner measurements, the height goes from bottom to lid, the lower rail is inside of the inner height.
- The width of the rail can be adjusted, wider rails are more stable but make the opening smaller.
- The horizontal margin makes the lid slightly narrower to prevent the lid from jamming.
- The vertical margin makes the gap between the rails larger to let the lid slide more easily.
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