Simple Stackable Box and Top

Easily scalable to a size that works for your needs. Slight bottom size offset to allow for the units to be stacked easily. The filet at the bottom also creates a gradual slope, so layer heights of 0.2mm and finer shouldn't require a support setting (or a support). Suggested 20% infill minimum.

The future model might include:
1. Interlocking sides
2. Slidable cubbies.