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Computing Electronics Technology

USB3 Extension Box

A USB 3 extension box for PCs with all the USB jacks hidden away on the back.

Newer computer cases often have all the USB connections on the back. That’s fine for some, but I have a very crowded lab, and it’s a pain to reach back there and fumble around trying to plug/unplug equipment. So I created this USB 3.1 capable extender box.

I started with a search of Tiger Direct, Amazon, eBay, and several other of the usual suspects. I was looking for a relatively high density way to mount female USB jacks. They had to be mounted in something with some mass to it, so it won’t skitter around when I try to plug things in, and it needs non-skid rubber feet too. Ultimately, I took the guts out of an old 2400 baud modem. Remember those? You’re dating yourself. That provided the box to mount the USB jacks into. A little aluminum plate, some machining with a drill, punch, and file, and some specialty USB jacks, and Bob’s yer uncle.

Back of that old modem
An old 2400 baud modem
Shuck the modem of its guts…
Leaving a usable case.

BATIGE Dual Ports Square USB 3.0 Panel Flush Mount Extension Cable

These are what the panel-mount USB cables look like; Amazon has them in both 3 and 6 foot lengths.

This is what I used:
https://www.amazon.com/gp/product/B078LXX3MD.

After considerable machining (by hand) of some scrap aluminum…

The final product looks like the photos below.

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