Back to the Future shoes use a super-thin flexible filament

Flexible filaments can be a difficult material to work with, especially when it comes to 3D printing. To lend a helping hand, Spanish filament producer Recreus has spent the last few months researching both the designs and materials that can be used to effortlessly print your very own flexible footwear.

The Sneakerbot II sneakers are made from a filament just 1.75 mm thick, which is why the company also had to develop their own extruder and hot end. Ignacio Garcia, the company’s founder and designer of the shoes, which have a part 80's part futuristic look, told 3D Printing Industry that the shoes offer a perfect balance between support and comfort.

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