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I have an issue with the stepper on my Rostock V2. I recently changed to a E3D V6 hot end and after re configuring the printer eeprom and recalibration I was able to print a reasonable calibration block. After the first block I was ready to run another part however (waiting a day or so) when I came back to the printer, after getting it up to temperatures, I ran into issues with the EZ Studer not pushing filament through the hot end - which was at 240deg by toch and by Matter Control reading. As this second print was completing the initial layer I could hear and see that the EZ Struder was having some trouble driving the filament which was evident by the skipping sound coming from the gearing or stepper. I stopped the print and tried to manually drive the filament through which worked fine. I used Matter Control to drive the stepper which is when I realized that the stepper was having some trouble with signal or a mechanical failure as the thumb wheel was only skipping not actually turning. Long story short, after tinkering a bit with controls, the stepper simply stopped with no evidence that it was either getting signal from the drive or that it could process signal into motion. Either the drive is pooped or the stepper motor is fried.

The question I have; is there a diagnostic that I can do from the control to test if the problem is a signal issue? I would rather not start disassembling my printer/EZ Struder if there is a way to determine if the board has failed. Any help would be very much appreciated.

Did you update the firmware? The reason I ask is that during the V2 production, they changed brands of stepper motors. The replacement steppers have a lower amperage requirement, and the newer firmware updates would have the current adjustments lowered.

Yes, I recently updated the firmware to the latest that SeeMe had on their site. Then I ran the printer for a calibration block which took about 1.5h. Then started to see that the stepper was not behaving, then it pooped out entirely. With the current change is it possible that the motor is now dead? Or will changing the current setting correct the issue?

If the current limiter is to low, the steppers will be weaker. You do need to verify that you have the older stepper motors. Off hand I don't know if they switched from Wantai to Kysan or vice versa.

The stepper is a Wantai 2.5A(U).

Thanks for the link Mac, helped a lot in getting to the problem.
Finally got back to the stepper problem today. Below are the new settings I changed in config.h. So far the stepper is still not responding and I am not sure if there are other config.h settings that are interfering - though it seems unlikely.

Looks like its time for a fancier nice new EZR Struder. It would be nice to identify what is or went wrong with the motor in that there are three others of the same make and vintage.

56// ################## RAMBo Digipot Motor current control settings ################
57// Values 0-255 (RAMBO 135 = ~0.75A, 185 = ~1A)
58// use 140 for xyz and 130 for the E if using Kysan/AutomationTechnology motors and 175 xyz and 200 if using wantai motors
59#define MOTOR_CURRENT {175,175,175,200,0}//Changed motor current settings on 12-31-16 from 140,140,140,130,0