You can get all the files here GitHub.
GUS is designed to be highly printable and very cheap. I want to make him the desktop standard. He is the most compact of them all but has a respectable 200mm diameter by 150mm tall build volume.
LISA is about $180 more than GUS but has twice the volume. This is the current best in terms of usability. LISA is slower than GUS or Wally.
Wally is just as cheap as GUS but has the advantage of being easier to calibrate for flat prints. Wally and GUS are actually almost the same in every way except geometry.
Ask questions below and I will flesh this out.