This is a wall or shelf mount for your Klein multimeter that also includes a shelf for the wires. I'm using it on an IKEA Bror unit with an M5x16 screw.
Prints without supports, but does include a sacrificial bridge in the clip that you'll need to remove (the blue lines in the image below, highlighted in green):

I printed in PLA but I imagine most filaments would do fine :)
The author marked this model as their own original creation.