After a couple of formula iteration, we developed a PolyLite™ CosPLA which was able to outperform the durability of regular PLA while being much easier to sand and paint. However we found a way to improve the sand-ability even more and another way to almost double the toughness of the material. Unfortunately we could not implement both technology at the same time, therefore we decided to go ahead and release two version:
Version A with the first technology improvement to enhance the sand-ability even more.
Version B with the second technology improvement to enhance the durability even more.

It is important to note that BOTH displays better durability and sand-ability than regular PLA while being easier to paint.

Hello Polymaker