3mm of space only leaves room for 1.5mm of extra radius per cable. I just eyeballed my cable drawer and I only saw one kind that might fit next to each other with that little clearance. It’s gonna be a pain… not a huge pain, but a pain nonetheless. idk why they couldn’t just add a little extra width and avoid the pain with most cables. Especially since what you’ll need most of the time isn’t going to be the 1/8” to 1/8” cables they’re going to give you - but 1/4” to 1/8” cables - since most instruments have 1/4” outputs