This is a series of boxes in different sizes that are printed as a single piece using multi-material printers capable of handling TPU.

IMPORTANT: To successfully print this box, you need to enable “Material interlocking” in your slicer, as TPU does not adhere to most materials. This feature is now available in Prusaslicer and Orcaslicer, and has been available in Cura for some time.

As shown in this video, where you’ll find much more details!