Plastic Buildup on nozzle exterior

[jimc]

pet is a sticky plastic. if you are getting it collecting on the nozzle then that means you are overextruding. if its only collecting while on the first layer then you are squishing your first layer too much. in anycase, its not necessarily from oozing. any overextruded material will be collected by the nozzle.

[adamfilip]

When I do a cube test calibration and measure the wall thickness its correct. So i feel my extrusion multiplier is accurate