Sortimo L-Boxx lboxx mini separator insert

I looked for other designs but didn't find one that works for me.
Here is my design I created completely from scratch.

The goal was to design a separator to get more smaller boxes. The L-Boxx mini comes originally with 6 separeted boxes. With these separators you can increase the number of boxes from 6 to 10.
Maybe I will also add the design for the middle boxes. Up to now I only designed the separators for the corners.

The design is composed of a "ground plate" and the "walls".
The ground plate fits in every corner - you just have to turn and flip ist.
The "walls" are different for the front and the back row.

The walls have to clicked into the ground plate an with the parts I printed it fitted without wibbling and shaking.

I printed the parts in PETG with these settings:
- 0.2 mm layer height
- 100% infill
- 250 degree printing temperature
- 75 degree plate temperature
- 45 mm/s printing speed