Stephen Sweeney built a transparent acrylic super-magnetic bases for baskets and portafilter holders, so we can watch a slow motion espresso shot.

Read the article by Nick Brown on DailyCoffeeNews: http://dailycoffeenews.com/2014/03/24/must-see-video-the-transparent-portafilter-in-slo-mo/

Thanks Réseau des Baristas de France – RBF!