how to make a combined gcode file (on windows)
Collect all the stl files in a single folder. Together with the program "gcmerge.exe"
Use cura to create gcode files for each stl file.
In this case 3 gcode files should be created.
Edit the file mergerecept.txt with notepad.
Put the names of the 3 gcode files in the file.
Double click on gcmerge.exe .
Note that this program is only tested with
outputs from Cura version 15.04.6
The file "combi.gcode" is created.
Copy this file to your ultimaker sd card.