what is the v-supply in extruder and hot end for?
@ekaggrat_singh_kalsi The MOSFETs are N-channel, which means they switch the negative (ground) side. When the MOSFET switches on, power flows between the HEATER and V_SUPPLY lines.
why is there a heater and v-supply both on the hotend and extruder? bowden option? also is the ribbon cable 30 awg enough for motor current of 1-1.5 amps?
The hot end cable is an optional extension for bowden extruders (so that you don’t have to run the whole cable including motor wires). If you have sufficient current capacity on each wire, you can drop that one down from a 16-pin to a 12-pin for an even smaller cable.
Ideally, this would be done with cicoil ribbon cables (rated for 5A per line, if you can believe that) and with 24V V_SUPPLY, but it’s designed to work even with common 28AWG (that’s the standard gauge for 1.27mm pitch cables, not 30, and you can also get 26AWG versions) and a 12V supply. The 28AWG versions are rated for 1A per wire (a 40W heater at 12V would be .83A per wire, which is the most current you should ever see), but they can handle more when they’re adjacent to lines that aren’t carrying significant current (or on the ends of the cable).
As discussed in one of the previous threads, though 12V and 28AWG stays within the ratings, the specification will say that 26AWG cable (if not the cicoil stuff, which is highly recommended, both for its current rating and its flex rating) and 24V (which means half the current) should be used.