Hi Mickman,
My issue wasn't due to the version of the Sanguinololu; rather the quality of the PCB Heatbed.
My PCB has a considerably lower resistance than would normally be required (0.85 ohm rather than 1.5 ohm); so to raise it to a high enough temperature, considerably more current has to be pumped through. While the current is within the specs for the MOSFET, it had no way to deal with the heat that this current generates; which is why my first MOSFET melted.
To be fair, this PCB Heatbed needs just over 14amps; which is very very high; well beyond the specs for most printed circuit boards. It wouldn't really have made a difference if I'd been using a RAMPs board.
I'll be looking for a replacement heatbed at some point, I've just been too busy to look.
Cheers,
T.
My issue wasn't due to the version of the Sanguinololu; rather the quality of the PCB Heatbed.
My PCB has a considerably lower resistance than would normally be required (0.85 ohm rather than 1.5 ohm); so to raise it to a high enough temperature, considerably more current has to be pumped through. While the current is within the specs for the MOSFET, it had no way to deal with the heat that this current generates; which is why my first MOSFET melted.
To be fair, this PCB Heatbed needs just over 14amps; which is very very high; well beyond the specs for most printed circuit boards. It wouldn't really have made a difference if I'd been using a RAMPs board.
I'll be looking for a replacement heatbed at some point, I've just been too busy to look.
Cheers,
T.
