hi guys! I need to heat the extruder up to 250° with repetier host. But I can’t use this software, can you help me? Thanks 
This gcode is to put the hotend temperature M109 T0 S185.000000 (185 is the celsius) Hope it helps!
So I must write “M109 T0 S250.000000” ?
in pronterface yes
in the command line, or save a .gcode file with that command or substitute the temperature in your gcode file 
Which firmware are you using? You will need to make sure that the max temp setting is above 250. The stock maxtemp for Marlin is 275 though so you should be fine there.
@Ryan_Hescock_Stanos sorry I don’t know, I’ve a Prusa i3 Hephestos stock