I'm thinking about purchasing my third 3D printer(I'm a 3D hub), previous two models one is using 3mm filament while another is 1.75mm.According to my printing objects there are really not so much difference of these two filaments.Friend said I did not run the 1.75mm machine in correct way, so what's the right way?Should my third 3D printer 1.75mm?Guys please give me some idea.