Bore Brush Adapter

thingiverse

For cleaning hobbed bolts, use a brass bore brush suitable for firearms. Set extruder to extrude nothing for 50mm and spin the brush in bolt's cuts. However, holding the brush comfortably while hobbing might be difficult. A helpful adapter screws into a 1/4" hex, fitting any screwdrivey handle. Note that its width is less than 1/4" across flats, requiring sanding or filing for a perfect fit. Tension on the hobbed bolt should be less than initially thought to prevent filament damage and clean teeth of the bolt from pixie dust. Measure bore brush threads carefully; I used .32 caliber. Printing multiple bolts at once is easier than adjusting Slic3r settings, so print six-up for convenience. If you have advice on printing settings, please share.