Here at 3D Rapid Print, one of the fastest growing 3D Printing companies in the Thames Valley, we like to keep abreast of the latest innovations in 3D printing.

A water bottle with a filter unlike any other, the Naked Filter was launched at the Startup Battlefield competition of American online publisher’s Techcrunch’s “Disrupt NY 2015” conference, where it won. It was entered by self-proclaimed “dedicated to solving the global health crisis caused by microbe-contaminated drinking water” company Liquidity of Concord, California. Between March and April 2015, they did a campaign on crowdfunding website Kickstarter for the Naked Filter that raised $80,000 of its $40,000 goal.

Liquidity’s Chief Technology Officer Michael Hawes is a former highest-ranking authority of the Worldwide Water Group of American multinational conglomerate 3M of Maplewood, Minnesota. “Senior Director of Technology & Engineering” Sylvie Chavanne was a technical head at water filter specialist Brita of Taunusstein, Germany. Chairman and Founder Dean Spatz pioneered the water purification technique of reverse osmosis.

Liquidity’s special filter uses a nanofiber membrane that is made via a combination of electrospinning and 3D printing. Electrospinning can be defined as “a process in which ultrathin, multifilament fibers with diameters in the nanometer range are created by spinning and manipulating streams of electrically charged polymers in a strong magnetic or electric field, used to make specialized fabrics, such as those in space suits.”

The Naked Filter is about 85% open space, allowing the water to flow through the bottle at mostly the same rate as if the filter wasn’t there; a traditional filter is about 20% open space. Its pores are just 0.2μm wide, ergo as well as removing impurities, it can filter out microbes like Escherichia coli. Liquidity had the filter tested by self-proclaimed “specialists in environmental microbiologyBioVir of Benicia, California, who concluded that the filter more than met the 6 log reduction value standard of the Environmental Protection Agency.

However, no one knows where Liquidity has gone since circa March 2016. As of the end of May 2019, the last post on their website’s news feed was to announce the launch of their Kickstarter campaign. The last post on the Naked Filter’s website’s blog was made on December 29th 2015, proclaiming that the Naked Filter had been referenced in a post on the website of the magazine Wired, which was titled “Survive Anything by Always Carrying These 13 Pieces of Gear.”

The last posts on the Naked Filter’s Twitter, Facebook and Instagram pages were all made on March 16th 2016, announcing the shipment of some limited edition Naked Filter bottles to some of their Kickstarter campaign backers, with all the bottles being signed Liquidity’s employees. The least old video on Liquidity’s YouTube channel was uploaded on September 23rd 2015, entitled “Naked Filter’s farewell to the TechCrunch Disrupt Cup.” On 3rd May 2016, a post was made to the Kickstarter campaign’s page’s update feed, which was simply titled “Naked Filter 2.0 Has Arrived!” Like most of the update feed’s posts, it can only be seen the campaign’s backers, ergo the details of the post are not public knowledge.

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Disclaimer: Featured image of “Unidentified woman using a water pump in a South St. Louis neighborhood” is a faithful photographic reproduction of a two-dimensional, public domain work of art; the work of art itself is in the public domain the United States because it was published or registered with the U.S. Copyright Office before January 1, 1924.