Had numerous issues with 5th Gen for a year. Needless to say, currently with 3.6 and the latest print head (3weeks old), I am getting some excellent prints on .2mm and .1mm. If you have an older head, they have issues. Smooth extrusion and no under extrusion, brittle prints or clicking. Also, I picked up some Build Tak sheets to print on and all my non-raft prints grab like crazy to the build plate. No peeling or curling.