ΔΕIΤΕ ΤΟ ΚΑΤΑΠΛΗΚΤΙΚΟ GADGET ΓΙΑ ΤΟ ΤΕΛΙΟ ΚΑΙ ΕΥΚΟΛΟ ΤΡOΧΙΣΜΑ ΤΟΝ ΜΑΧΑΙΡΙΩΝ ΣΑΣ.ΠΡΟΣΑΡΜΟΖΕΤΑΙ ΣΤΗΝ ΚΟΥΠΑ ΤΟΥ ΚΑΦΕIt also works in this orientation.I recently made a 3D printed device that attaches to a standard ceramic mug and lets you use it to sharpen knives. It's a fairly well known idea that it is possible to use the ring of unglazed ceramic on the bottom of a coffee mug to sharpen a knife. Usually this is done by turning the mug up-side down and rubbing your knife along the surface while maintaining a 20 degree angle between the two. There's a nice article about it at BackwoodsHome.com.
I have been exploring the uses of 3D printing that have a net-positive impact on the environment and this is one good example. If you break the handle on one of the mugs in your house, you would probably normally just throw the rest away. If you instead turned it into a knife sharpener, you are extending the useful life of the mug. Additionally you are extending the lifetimes of your knives meaning less knives will need to be produced. Printing the plastic part does have an environmental impact, but if it is used successfully, it will result in more environmental good than bad.
If you're interested in the overlap between sustainability and 3D printing, please check out my blog entry on the Autodesk Sustainability Workshop Blog.
http://www.instructables.com
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