These pans are in the style and size of Kuretake Gansai Tambi pans and are PERFECT for getting large amounts of paint on large brushes. Use this to add different colors to your existing palette or start your own. Holds 7.8ml of paint and easily handles 1" brush.
You can also cheaply purchase empty pans from Kuretake or pans with paint for around 2.5-3 USD. They're really great inexpensive paints and they have a large variety of colors.
That being said if you really want to pump out some large pans using your 3D printer I've uploaded this model.
Dimensions:
45x25x10mm
I have included a size comparison photo to a full sized pan.
I have many other watercolor pan models of various sizes, you can view them in this collection.
The author hasn't provided the model origin yet.