I made this one inspired by several other solutions. It is designed so it should be possible to print on my LulzBot mini.

There are three versions. The original one is the low profile one (CableManagement.stl). Good enough for most charging cables etc. That one is 120 x 120 x 60 mm. With nine holes for cables. I added four holes for pens or tools as well. Those holes have a diameter of 14 mm. Took 6 hours and 30 minutes to print on my LulzBot Mini with the default High Speed setting for ABS. The diameter of the holes is 38 mm and the depth is 58.5 mm. The depth of the four smaller holes for tools is 50 mm.

The next version (CableManagementDeep.stl) is 120 x 120 x 120. Holes are still 38 mm diameter but can hold longer cables because they are 118,5 mm deep. The four holes for tools are 80 mm deep on this one.

The last version is (CableManagementSmall.stl). It is for small printers. So it is 80.5 x 80.5 x 60. Print several and glue them together. Or if you have a bigger printer but wants to make a pattern with several of them in different colors.

Edit:
Added a 120 x 120 x 60 that has square rooms (TidyManagementSquare.stl). It will use less filament and print faster. And matches the other ones in size. So you can combine several of them.

Download other file formats here:

CableManagement: https://myhub.autodesk360.com/ue29b8ffe/shares/public/SH7f1edQT22b515c761e8b619197d6b252c6

CableManagementDeep: https://myhub.autodesk360.com/ue29b8ffe/shares/public/SH7f1edQT22b515c761e9dbfa49427d07110

CableManagementSmall:
http://a360.co/1MR9pWx

CableManagementSquare2b:
http://a360.co/22ZIny1