RetireeJay wrote:So issue an M503 command and look for the calibration line for the X, Y, Z, and E axes in steps per mm. The correct value for Z steps per mm depends on your particular Z actuation screw, but it's typically somewhere near 2000 give or take 500 or so. If yours has gone to zero, or a small value, then try issuing an M502 command, which will reset the EEPROM values to "factory default."
RetireeJay wrote:As a last resort, if this doesn't fix it, you could try re-flashing your firmware. Doing so is rarely needed, but it's free and does sometimes solve some problems. However, re-flashing can also introduce new problems if you don't use the right version, so beware.
RetireeJay wrote:Do you have a multimeter? With power off, you could compare the ohms you see between pairs of pins on the Z connector versus pairs of pins on another motor's connector. The driver chip uses the two pins on one end of the connector to drive one coil in the motor, and the two pins on the other end of the connector to drive the other coil. Check the readings in both directions (let's call them forward and reverse).
RetireeJay wrote:It might help to be more specific and detailed about what was going wrong that prompted you to kill the print.
RetireeJay wrote:Were you measuring volts or ohms? The little "v" beside the numbers makes me think you measured volts.
But in any event, although the numbers for Z are slightly lower than the numbers on the other channels, the difference is not significant enough to explain your total loss of Z actuation. It's possible that your board has a hardware defect, meaning a break in the conductor between the Atmel chip and the Z stepper driver chip, so that the commands to perform steps are not arriving at the driver chip. Since you found the board layout, I presume you can also find the board schematic and figure out which pins are involved; then you could check the resistance between the driver chip "step" input and the corresponding Atmel output pin to see if it's zero.
RetireeJay wrote:It's curious that the bottom of the print on the right (the one with the strings) looks much more "porous" than the print on the left. Were you printing both of them at the same time?
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