Numerous patents seem to reference that provisional: http://www.freepatentsonline.com/result.html?sort=relevance&srch=top&patents=on&query_txt=61%2F719%2C874&se

Numerous patents seem to reference that provisional: http://www.freepatentsonline.com/result.html?sort=relevance&srch=top&patents=on&query_txt=61%2F719%2C874&search=Search http://www.freepatentsonline.com/result.html?sort=relevance&... I am not sure how to get a look at the original provisional application, but it looks like these are extensions on top of the original provision patent application, which could be just about anything, since the other related patents include things like http://www.freepatentsonline.com/y2014/0121813.html http://www.freepatentsonline.com/y2014/0121813.html <- I've been filling with urethane glue for a while now, as a side note, http://www.freepatentsonline.com/20140120196.pdf http://www.freepatentsonline.com/20140120196.pdf <- http://www.thingiverse.com/thing:12320 http://www.thingiverse.com/thing:12320 http://www.freepatentsonline.com/y2014/0117585.html http://www.freepatentsonline.com/y2014/0117585.html <- everything from lexmark/HP/etc. Oh, and a workaround for existing implementations already exists: http://hackaday.com/2013/04/26/cube-3d-printer-hack-lets-you-use-bulk-filament/ http://hackaday.com/2013/04/26/cube-3d-printer-hack-lets-you... Reading over these, they really look like a landgrab on ideas that have been floating around in the reprap forums for a while now.