Using the printer's built in slicer causes all sorts of havoc. It always prints support material, when it starts printing it auto levels the build platform twice, causing streams of filament to ooze all over the place during the second "calibration" The routine to start printing should heat the print bed first but it doesn't. What ends up happening is during the time it takes to heat the bed, the extruder starts spitting out plastic, forming unwanted balls of plastic at the nozzle that get dragged into your print job. Work-around, pre heat the bed, don't let the R2 do it for you. Cura 2.5 Print to Octaprint fails to work. It says "Printing to Octaprint" with percentage. When it gets to 100% the printer does nothing. Workaround, save the Gcode to your PC or MAC and drag/drop the Gcode into your web browser running Octaprint. Other than that, so far so good, print jobs look fabulous of the ones I have done.