RP900A is the latest 3d printing pen launched at the CES show this year. It is the world's smallest 3d printing pen.
The mockup of this model has been brought to the IFA show in 2016 and the working sample has been brought to the CES show early 2017. However, it was not until 10 more modifications we've made did we put it into mass production. Before that, modifications or optimizations of it has been done for countless times. The goal is to make a perfect smallest 3d printing pen.