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Very cool idea,
One motor would definitely be more than capable of producing the required torques even through a flexshaft connector. For any normal sized 3D-printer the torques required, and the speeds you'll need for rapid response are well within the capabilities of any off-the-shelf stepper motor.
Just a note on the idea though, with a normal, 'rigid'...
3
If you're talking about a common 3D printer stepper motor and driver, then one driver is perfectly capable of driving the motor both forward and backward.
The flex tube setup you describe sounds like a Bowden extruder.
3
So basically you just replaced everything except for the LCD (the LCD testing is described a little further). If the LCD is not working then, this could imply that either your LCD is broken, or one of the new parts is not functioning as expected, or you have not connected things correctly.
Are you sure the firmware flash went okay? You could test the ...
2
I second the previous answer if running second Z motor in parallel, just split wires or buy adapter consisting of two females to one male, Z motor on most printers don't draw huge current (or at least in smaller less frequent intervals to give things time to cool).
Erm I extruder with two temperature zones, hmmm buy a larger heating element, like a E3D ...
2
It was the stepper driver, Replacing the motherboard fixed the issue.
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Sounds like one end or the other in your stepper cable is not seated correctly or has shaken loose there are 4 wires if even one doesn't make proper contact you will get a shaking back and forth almost like a hard vibration. I always take a cable from one of the other steppers plug into this one move the motor with good stepper wire 10-20 mm see what ...
2
So it would seem that there is always a pulsing waveform across the windings whenever the stepper is energized, correct?
Correct.
When the motor is holding its position, is there anything distinctive about the waveform?
Yes there is. This video contains a short example of what the current waveforms would look like.
If I understand you correctly: You ...
2
Ok, thanks everyone for at least taking time to read or thinking about this.
The Problem is an absolute mess and there are two possible reasons:
-> the octoprint eeprom editor is broken
-> the ATMega2560's eeprom is broken. as far as i know companies buy used atmegas to cheapen the price and the >100k writes on my chip has been reached
I will try to ...
1
Okay, so after yet another frustrating night of troubleshooting. I believe I have identified the specific problem. I reduced the G-code file to about 100 lines of code, that 100% reproduced the issue on the BIQU H2 stepper. With the original 4042 stepper, the problem was intermittent, but did occur from time to time in the same part of the print.
I pulled ...
1
During normal extrusion backlash has no effect.
During retraction you can perfectly compensate by increasing retraction length slightly.
Backlash cannot be taken into account for pressure advance, but unless it's a lot, it should not cause issues: pressure compensation is a second order effect and does not need to be tuned super accurately to produce results....
1
After a rebuild, and certainly after changing to another extruder (e.g. replacing it by a geared extruder like you supposedly did as taken from the comments above before the edit, which now clearly is not the case) or setup e.g. other stepper drivers, you should always calibrate the extruder.
To calibrate you e.g. disconnect the hot end nozzle and command ...
1
According to all the information:
No reassignment of the extruder in the Gcode
You can extrude if you push the filament by hand
Extruder motor works when switched to Z driver
Z Motor works
I come to the conclusion that some of your electronics or the motor have fried.
What have fried? I tried to make a step by step check:
Switch drivers between E and Z, ...
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