I have made a box for electrical installation for signal cables and 12V systems. You can use it on an existing system and doesn´t need to cut the cables. Just add the appropriate parts of the size of cables. I also added the possibility to fasten the cables in the box.

This box is a size of L=80, W=50, H=37.5 mm.  (a little bit higher than my other version)

Box:

• PETG
• Perimeter of your choice
• 15% infill

Small parts:

• Print them standing
• Support for printplate
• No Brim needed
• The smallest parts with biggest holes, just print them one by one. Risk of  loosen!