While going mad about the ooze of my extruder, I came about several calbibration pieces for testing ooze and retraction. After printing the nice test piece of Hardik about twenty times. I decided to make one that is sliced and printed even faster and shows several problems of ooze in one piece.For finetuning your GCode generator, slice the item and watch for:-don´t forget to activate cool! -thin filaments in free space(probably to less retraction) -thin segments of printed layer (probably to much retraction)For me it´s still impossible to completely get rid of ooze, perhaps cause of the extruder setup, so further work must be done here.With an upgrade to the Ultimaker, Ooze is defeated very well using several mechanism present in the slicing software and the machine itself.