I have been trying to get a second extruder working with Repetier on a Megatronics 2.0 board with little success. The problem is Extruder 2 doesn't turn when it is selected.

In Repetier-Host I can select Extruder 1 and tell it to extrude an amount - its motor turns. If I then select Extruder 2 and tell it to extrude then I get nothing - the motors magnets engage but there is no motion.

It isn't the stepper as I swapped them over and Extruder 1 still turned and 2 didn't. It isn't the pin number settings as I confirmed against the circuit diagram.

As an experiment I swapped the pin settings in the pins.h, so extruder 1 became extruder 2 and vice-versa. In the host I told it to drive its extruder 1 and extruder 2 motor turned on the machine, telling the host the drive extruder 2 and extruder 1 motor done nothing. (I hope that makes sense!) From that I was able to get that the problem is not hardware related.

It is only the motor that isn't working. The firmware is reporting the temperature for extruder 2 and will happily heat it on command, it just won't turn the motor.

I was wondering if anyone else has been able to get a second extruder working on Repetier? If so did it work straight off the bat?

I have posted this on to Repetiers github as well, but thought I would also repeat on here in case anyone else is having the same issue.

Solved! It was something to do with the eeprom. I noticed curruption in the eeprom (reporting total filament as NaN). I changed the eeprom offset to force the system to re-write the eeprom and get rid of that error.

On the off chance I tried extruder 2 again, and now it works!

Thanks for posting, I got exactly the same problem and saved a lot of time by finding your post! :-)

Cheers!