Hi,
I've just changed my workflow a bit (among other things, I now have the original heated bed for the Ultimaker Original and this is also my first print with Nylon, but that is probable not the problem here).
I've started to use FreeCAD and I'm trying to print a part that comes out somewhat "inverted" - features that should be printed are left away as if something is wrong with the model. I do not know what software or step causes this, so let me show you my files and pictures below. As you can see in the last picture, the vertical part at the rear end and the rim around the whole part have been omitted and there is a blank surface instead. I stopped the print when it became clear that something is going wrong.
The work flow is: I design in the Part Design workbench in FreeCAD, then export as .stl, input into Cura, change some settings (mainly temperature I think), then copy onto SD card.
I'm using Ubuntu 15.04 with FreeCAD 0.15 and Cura 15.04 (installed the firmware from that, too, newest version of Cura crashes on my computer).
Model in FreeCAD:
wrong.fcstd
Model in Cura:
wrong.stl
wrong.gcode
Outcome:
Mirko