Bondtech BMG (and clones) 3.5mm installation washer

thingiverse

This is a precision-cut 3.5mm washer, engineered with a strategically placed cutout that facilitates the exact installation of the cog onto the motor axle during assembly of a Bondtech BMG or a compatible clone. To achieve optimal results, print at a layer height of 0.1mm (or the closest multiple of your preferred magic number that yields a 3.5mm high component).