I just printed one of these today, but unfortunately I left it at school where the printer is, so I can't take photos. The print was actually stronger than I anticipated, so some revisions to reduce weight are in order. It has a way to go, but there is no need for support material, just as I hoped!
Well, for the first prints I made, I used the wrong extrusion settings on the printer, so the parts didn't fit right. With the proper extrusion settings, it was *really* close to fitting. At least with the printer I'm using, I had to shrink the end of the arm part from 20mm to 19.56mm (scaling evenly in all directions), but in theory the dimensions I have in the model should work.
I figured out the right sizes by just tweaking and printing this: TestQuadracopterprototype Mating Parts?
Do you have own printer? Which printer is it... Just curious. I've mainly used Replicator and also services. I've used Replicator usually, with default settings needs to have about 0.25 mm clearance with fitting parts ("if upper side of the lego's one button would be d=3mm, then bottom side hole should be 3.25mm").