I wonder if we’ll get to see any failed prints. 
http://www.cnet.com/news/the-iss-gets-its-zero-g-3d-printer/
I’ll bet they can do bridging prints like nobody’s business!
@Jim_Wygralak You are on to something here! We can build a system that drops the printer when it detects bridging to simulate zero G, and then brings the printer back up. It would only need a 20-30 meter high ramp. Totally doable.
No. just turn the printer up-side-down 
Not upside down. Sideways. Just rotate the whole printer such that bridging moves are always vertical, top to bottom. Mount the whole works on a gimbal, driven as two more axes in the g-code.