There are currently 2 sizes, with some differences in functionallity.

The Wally340 (with 340 needles) that allows you to create sweaters or garments of a similar size.

and the Wally120, designed to be portable and cheaper. It can create garments up to 30cm wide, like accessories; scarfs, beanies, socks, etc.

(This 3D models can be downloaded from https://github.com/g3rard/OpenKnit/tree/master/Wally120/3Dmodel https://github.com/g3rard/OpenKnit/tree/master/Wally340)

More info in the blog of the project http://openknit.org/