The octave light R1 3D resin printer created in 2016 is an amazing feat of engineering. The one that I recently purchased was made in 2019. It was in great working condition until I took it completely apart. I did a very careful job saved all the screws and wires and stuff. This particular listing is for the Resin Tank. With a spare resin tank, you can store resin of different types in the tank so it's ready to go. It has a snug fitting rubber lid, and a sturdy base.