yeah put crap in get crap out. there is a certain grade abs for 3d printing. you dont want to just throw any old thing in there. abs for printer filament is pa-747. be sure your pellets are that grade. as john said, consistency is the key. i cant imagine a $300 machine having quite the tolerance that a $100k extruding machine would. they all have laser measuring to be sure everything is right as well as filtering. you need to pre-bake the pellets as well to make sure the moisture content is non existent. with that said, if you can consistently put out a good product, you will eventually get regular customers.