Hario Skerton coffee mill electric screwdriver adapter

thingiverse

This is another adapter that enables motorizing a Hario Skerton manual coffee grinder using a standard hex shaft electric screwdriver like an IXO as shown in the image. The key difference with other models available on Thingiverse is that this one can be mounted without removing the handle or nut, ensuring the grinder stays intact even if it's toppled over and allowing for seamless switching to manual mode at any time. It's crucial not to use a tool spinning faster than about 3 revolutions per second as this could damage your Skerton. This part must be printed with maximum strength in mind since it will need to withstand considerable force. Any type of filament can probably work, but I recommend ABS or PETG. Print it slowly and carefully with thin layers and disable the fan unless absolutely necessary, such as for the hex shaft which might become misshapen without extra cooling. A high infill of at least 50% is recommended, although 100% may be the best choice. Additionally, print with a high number of perimeters for extra strength; I used four. A PETG model I printed was able to withstand the force exerted by an IXO being jammed on a stubborn coffee bean but eventually broke at a weak point caused by incorrect fan settings. I then printed another one in rigid.ink ABS filament, and that one held up for quite some time until I broke it by making a wrong move with the IXO. I was actually amazed at how robust a home-3D-printed part can be. Update 2016/12/30: I added an alternative model accepting a hex shaft, which should be less prone to breaking. Even without a metal hex shaft handy, you can still print the provided one-inch shaft, which might be more resilient than the upwards-pointing shaft integrated in the other model because its layers will be perpendicular to the torque forces. Still, you'll need incredibly strong filament and many perimeters to give this shaft any chance of survival. I tried one in ABS but it eventually broke. Then I tried one in PLA, which surprisingly has held up so far. I'll be honest that this is more a novelty than something really practical unless you can have it printed in metal or some other nearly indestructible material. Even the strongest typical filaments won't survive if you tilt your electric drill too much, putting undue strain on the base of the hex shaft and breaking it. Even the alternative model accepting a separate hex shaft is much more robust but still not terribly practical. If you're too lazy to grind your coffee manually, buy a motorized grinder. Print Settings: Printer Brand: FlashForge Printer: Creator Pro Rafts: No Supports: No Resolution: 0.1 mm Infill: 50% Notes: The photos show the part printed with rigid.ink PETG and silver ABS. Next to the regular models, another one with a pre-made tiny support is provided which can help with blobby filaments to get an accurate print of the small overhang at the bottom (just cut off the support with a knife). If you want to print the hex shaft, a raft is highly recommended because printing it with many perimeters or high infill will increase the risk of warping during printing. Print it with the strongest filament you have. The shaft STL model has exact dimensions; you may need to sand it down a little bit for it to fit in your drill.