Less than a year after releasing its Slic3r Prusa Edition software, Prusa just introduced the latest update for it, which includes improving the printing of water soluble supports. While Version 1.33.3 introduced Smooth Variable Layer Height and 1.35.3 featured a better 3D scene manipulation, the latest update, 1.36.2, allows the Prusa i3 MK2 Multi-Material printer to use soluble interface support material only on interface layers, which will help users save on the cost of the expensive material. Most of the soluble support materials Prusa worked with while testing out the various water soluble printing techniques were stringy, and sometimes even jammed the multiplexer. But they also happened to discover two materials that work very well with the Multi Material upgrade. Read more at 3DPrint.com: http://3dprint.com/184948/prusa-water-soluble-supports/