Quote
cagtag
...but there is also sound (like a music) when extruder print a circle shape. I listen to Zortrax, Makerbot and Ultimaker, there is no sound when printing. Why? What are their boards, motors or motor drive?
That sound is entirely normal unless you either use stepper drivers with very high microstepping (e.g. 256x which is what I use), or you use dampers and soundproofing which I expect the commercial machines have.