3D printing using OctoPrint on Linux Ubuntu desktop I'm trying to set up OctoPrint on my Linux Ubuntu 16.04 desktop to work with my Micro3D printer. The printer works fine on Mac and Windows:


I've installed OctoPrint with the M3D Fio Plugin Manager. I can see the files in ~/.octoprint/ fine and I can even turn the printer fan on/off, move the extruder, etc. through OctoPrint:


But when I press the blue "Print button", there is no response. Also the files in the "upload" section are greyed out. Must I download a slicing program or something? I'm new with 3D printing in general but not with Linux. Grateful for help!
I just discovered that OctoPrint only reads .gcode files for printing (apparently, unless you have a slicing software embedded in it), so I installed Slic3r separately, and ran

./slic3r mystlfile.stl


to generate a .gcode file (in the executable directory).

Then I uploaded the .gcode file to OctoPrint and things got moving.