Let me preface this with a statement: I don't like painting! I mean, I am really bad at it and don't have much patience for it.
With that being said, I didn't want to try and paint freehand the black parts on the chest of the stormtrooper, so I remodeled it with the design embedded in it (v1_ST-body.stl). While this looks good, it is very detailed and I figured out rather quickly that I would not be successful at painting it.
So, I decided to create a paint-free version (v2). I removed the arms for easier printing (creating lego-style buttons to attach them to the body), and then created two different layers (one black and one white) to create the chest piece. The order for assembly is: base, black layer, white layer). Caution: the black and white layers are only 1mm thick so use caution removing them from the print bed.
Next, I tackled the head. I removed everything that I thought should be black and created them separately as a add-on to the head. I created cavities in the head where are the pieces fit. They fit snugly and should only go one way.
This is only the parts I modified. I did not upload all of the original parts that I did not alter (the legs, hands, axis,and leg top.
Also, it may not look like it but assembled, this print is fairly large: 340mm x 180mm x 120mm (HxWxD).
The only piece that requires support is the arms (because of the lego-style connectors).
I used brims on all of the small head pieces. Here are my approximate print times (h:mm):
Legs Top - 3:07
Legs - 6:00
Hands - 2:39
Axis - 4:22
Body base (v2) - 6:37
Body (black layer) - 0:31
Body (white layer) - 0:48
Body arms - 3:31
Lego Head - 6:36
Eyes, Filter, Caps, Band caps - 1:07
Head band - 0:14
Total print time - around 36 hours
Did I mention I hate (and am terrible at) painting? None of the parts require painting.