I've got a newly built Prusa Mendel with a RAMPS 1.4 board running Marlin firmware being driven from Prontrface. I'm more or less calibrated and have printed a couple of calibration pieces. Hurrah.
Just the other day, the extruder stopped printing part way through a print. Bah.
I find that when every thing's just fired up from cold, and the hot end has reached temperature (240 deg) I can extrude and reverse, but after a short while the extruder doesn't respond to extrude or reverse commands. This is repeatable. Once it's stopped, I can turn the extruder gear by hand and it extrudes plastic OK. This suggest that the polulu stepper driver isn't sending anything to the motor (the command appears in the Prontrface console though). The motor is not hot and is clearly not energised, yet it starts off working properly. The other motors are all working fine.
I'd appreciate any suggestions as to how to tackle this.
Cheers, Chris.
Just the other day, the extruder stopped printing part way through a print. Bah.
I find that when every thing's just fired up from cold, and the hot end has reached temperature (240 deg) I can extrude and reverse, but after a short while the extruder doesn't respond to extrude or reverse commands. This is repeatable. Once it's stopped, I can turn the extruder gear by hand and it extrudes plastic OK. This suggest that the polulu stepper driver isn't sending anything to the motor (the command appears in the Prontrface console though). The motor is not hot and is clearly not energised, yet it starts off working properly. The other motors are all working fine.
I'd appreciate any suggestions as to how to tackle this.
Cheers, Chris.