When trying to properly manage cables for your DIY project, you frequently Need to arrange cables. This thing can help - you can put your cables in the conduit and use the Slots for cables to come out to PCB, Switches, fuses, power supplies etc.

I uploaded a 20mm x 30mm x 200mm conduit, together with the lid, but you can use FreeCAD to cusomize all the dimensions as you want. Just open the Spreadsheed "Parameters" in FreeCAD after loading the .FCStd file and adjust Parameters as you like, making the conduit wider, higher, longer you can even change the Slots the mounting holes or the wall thickness. I would recommend to export the resulting conduit, as the Current parametric model is already rather slow, so you will not want to have something like this in a larger model. But FreeCAD can Export all major formats and - as the Name says - is completely free.

I used FreeCAD Version 0.17 for this. I am not really happy with the parametric design. It seems to bee pretty random, when changing dimensions that the solver complains abount redundant constraints or to many degrees of freedom. The only thing that hepled me was to change parameters in small steps, then in most cases it works. (I guess I should have used OpenSCAD instead...)

I recommend printing in PETG or ABS, as ordinary PLA will be to brittle for it.