Under Desk Headphone Hook
thingiverse
The screw hole is designed to accommodate a #6 Wood Screw. You'll likely want to smooth out all the edges so your headphones' pads don't get caught on any rough spots or lumps. Check out the OnShape document at https://cad.onshape.com/documents/a2a3f02a3be84ce381d144eb/w/bc9ea9c693924f2c92c4aa49/e/3d2d4e24bff3444b8b004ff8.
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