the k1c user. print as very well. pla first print ok 300 and 600mms. abs creality 250 mms ok too. not try another yet. firt time using and experience 3d print. awesome printer. have ptu here too, but need have better slide on ptfe tube. it is a minus problem. close of extruder have a high dregree so you need update top case to be upper 10cm to tube ptfe not be havt dreegre for use thing like tpu. pla and abs ok until now. thank you creality to great product. fot tpu I pretend to use "maybe" with 0.6mm nozzle. maybe buy it on future, is better to kind of filament. researching timing yet to use this king of filament.