Geeetech

Hi everybody ! I'm new in this forum. I just bought my 3D and I have a problem with motor direction ... I tried to change the lines codes in the configuration.h in Arduino (i'm a beginner) and transfer it on my Prusa i3 but I have this message : {...} avrdude: stk500v2_getsync(): timeout communicat...

One thing I am not seeing in all of this documentation, is which programmer I am supposed to be using. When configuring the Arduino environment for programming, what is the right programmer to select?