This is a system to organize a Prusament box with unlimited flexibility. The position of divider walls can be adjusted exactly where you need to.
There are four types of connectors: T (for a connection in “T”), Q (quad, for a cross-connection, EL (extended to left) and ER (extended to right). EL-connector is for to leave room for the flaps of the Prusament box.
The 3D Onshape models (you can get a free Onshape account!) are fully customizable with self-explanatory variables. The default value for ChannelWidth is 1.3 mm, suitable for 1.7 mm three-layers undulated cardboard.
As an example, an electronic kit can be accommodated in a Prusament box with all you currently need (including tools) using 10 T connectors, one Q connectors, 2 EL connectors and 2ER connectors.
PLA, default settings, no supports.
The author hasn't provided the model origin yet.