Yamaha UR12MK3 Under Desk Mount Bracket with Cable Holder
Simple bracket for attaching a Yamaha Steinberg UR12MK3 audio interface under the desk with cable holder.
The cable holder is approx 6mm in diameter.
You need to print two pairs as the picture shows.
It may work with Steinberg IXO12 too, since the dimensions are identical.
You also need 4 short wood screws.
I mounted my UR12MK3 with this a month ago, and it's been working fine.