FOSBOS is an completely free organizational system, every model is open sourced including both fusion 360 file and the step file. All the drawers are designed after the gridfinity standard.
This model is a bin for storing your 4mm OD PTFE Tube that fits in any of the drawers that is at least 2u high. There are 4 different models, 3x3x2, 4x4x2, 5x5x2 and 6x6x2. The 6x6x2 has been split into 4 different parts which will all fit nicely next to each other in a 6x6 base grid.
The 3x3x2 model will hold up to roughly 1m of PTFE tube.
The 4x4x2 model will hold up to roughly 2m of PTFE tube.
The 5x5x2 model will hold up to roughly 3m of PTFE tube.
The 6x6x2 model will hold up to roughly 4,5m of PTFE tube.
Please have a look at the assembly model(here) for more information