Research activity into 3D printing never seems to end, with an almost constant stream of new techniques and improvements upon old ones hitting the news practically daily. This time, the focus is on a technique we’ve not covered so much, namely binder jetting additive manufacturing (BJAM for short, catchy huh?) Specifically the team from Oak Ridge National Laboratory, who have been exploring the use of so-called hyperbranched Polyethyleneimine (PEI) as a binder for jetting onto plain old foundry silica sand (nature, free access.) After a few days, the curing process is complete, resulting in a structure that is reportedly stronger than concrete. Not bad for some pretty common materials and a simple printing process.

Source: Economic Times November 21, 2021 21:01 UTC