I don't need wrenches that often, but when I do it's guaranteed they are nowhere to be found. If I happen to find them, the 10mm one I most often need has mysteriously disappeared. The plastic replacement is pretty much what you would expect, use it for lighter duty things.

The opening/jaw/whatchamacallit is exactly 10mm wide, so you might need to scale it up or down depending on your printer.

Print it HOT and all walls for max toughness. I printed the one in the picture with FilamentPM PETG at 250°C/80°C.

Since I'm currently running a 0.8mm nozzle I had to tweak Arachne settings in PrusaSlicer to get the crescent part to fill properly. I changed “perimeter transition length” to 25% and "perimeter transitioning threshold angle" to 59°.