I have an airwolf HD. I'm trying to print on black pla from matterhackers, but it wont extrude evenly. I'll try to extrude into open air for 100mm and it will start extruding, but then extruder starts clicking for a couple of seconds then it continues to extrude normally and then it repeats. I've tried increasing the temperature all the way to 220 but still doesn't work. Any help is appreciated

Thanks.