I've been using S3D for about 2 months with my Monoprice Mini Select without a problem. Last week my Prusa i3 Mk2 arrived. I put it to work right away printing around the clock for about 5 days without an issue. Then I had a strange problem with one part where the extruder stopped after about the 10% point. After that the printer was just going through the motions.
At first I thought it was a nozzle clog. So I cleaned it up and tried the part again. And, again, at about the 10% point the extruder stopped. I then tried a different but similar part to print. And, again, at about the 10% point the extruder stopped. I then selected a completely different part from a different vendor. It printed just fine. I then when back and selected a part that was also similar but different than the two problematic parts. And, yes, the extruder stopped. I went back to my MP Mini to print the first two problem parts. And they printed without a problem. At this point I used Cura 2.4 to slice the problem parts for the Prusa. And viola! They printed.
So, what the heck is going on? I don't tweak my slicing setting. About the only thing I ever change is the layer height and infill. And I doubt it is the STL vendor. They also print their models on an i3.
Here is a really terrible photo of the failed parts. As you can see the extruder stopped just after finishing the floor board areas.
http://prntscr.com/f5nlr8
The curved parts are balconies from an observatory model by Printable Scenery. And the big rectangular-ish part is a Merchant building also by PS.
http://www.printablescenery.com/product ... servatory/