Brian T. from Arizona shows how you can remix 3D files and create new items.
There are a number of baby Groot sculptures in Thingiverse. Brian got tired of seeing his baby Groot look sad and found a happy baby Groot. But happy Groot is waving, making it a 3D printing nightmare requiring extensive supports and such. So Brian re-mixed (or combined) the two files, creating the sitting happy baby Groot you find here.