Thanks! I found GRBL but it needed many modifications to work on a 3d printer. I'm going to use a STM32(more Pins) or ATmega328P(Cheaper) in a low cost (less than 500$/€) fully assembled 3d printer. This printer will be very similar in specs with prusa i3, about the same printing volume, a little bit faster (I hope), one extruder(E3d or custom made), way smaller, heated bed with acrylic panel(glass sucks), et cetera.