Had a pair of multimeter probes with banana plug connectors and wanted a convenient wall holder for them. The 8mm front mounting hole is a perfect fit for the head of 3/4" pocket hole screws from Kreg which I happen to really like.

I designed it in Autodesk Fusion 360 and printed it in beige PLA 0.2mm layer height with support (for the front mounting hole) - easy print.