9mm X 4.25mm X 1.5mm Washer

I made this to be a 9mm OD washer with a 4.25mm ID hole and 1.5mm thickness, for use as replacements/additionals for the Robo 3D extruder tension screws. The reality of it is that it printed for me at a snug 4mm (still getting my head around inflation), but that actually turned out to be a mad bonus. They actually thread on easily and don't fly off when you let go of the compressed springs - the threads keep them caged to the bolts. Oh happy day; now I don't have to chase washers all over the ho