Extruder Nozzle Wrench
thingiverse
This wrench is designed specifically for the nozzle of your 3D printer. I created it by modifying a standard 1.75mm filament nozzle to fit a .4mm nozzle diameter. As a result, you should be able to print with it without having to adjust its scale, but keep in mind that I haven't yet had a chance to test print with this wrench myself.
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