"I am Groot."
I re-sized the box from the original to fit Groot and repaired a few things in the mesh so it would look and print better.
I got the best results by printing Groot at 45 degrees and adjusting my support angle to match. I also had to use a few supports for the control panels on the main box, mostly to keep the underside from sagging.
Update - 1/16/2019
Seems there was a problem with the panels on the left side of the box. They were not fully merged into the rest of the model, so I guess they would try and slump off on some printers. I adjusted them in a little and made sure everything was all one shell. I'm also including separate files for box and panels for anyone that wants to print and assemble instead.
I smoothed out a hash angle in Groot's neck so it no longer looks like something pieced together.
I adjusted the support arm post so it will hopefully fit the hole in the base better. I also included a slightly angled arm because why not.
Update - 12/6/2018
It was pointed out to me that the control boxes were upside down. I flipped them over and re-uploaded the file.