Tags: exrtuder motor
- HenryParticipantJune 25, 2016 at 10:08 pmPost count: 19
So I just finished building my MPCNC yay!!
But when testing I found a problem doh!!
I printed the pieces out myself but the hardware/electronics/extruder were all purchased from vicious1.
Without any filament in the extruder it seems to only move a single step and then back again when attempting to extrude/retract. It won’t go continuously in either direction. I get the same result with the hotend cold or hot, I tested both wondering if it was Marlin’s underheat protection but that doesn’t seem to be the case. I used a multimeter on the extruder motor wires to make sure the motor coils were wired in pairs correctly and that does seem to be the case.
All the other axis/motors move normally. This is the second ramps based printer I have built so I’m not unfamiliar with the basic setup but I haven’t seen this problem before.
I’m not sure what else to check.HenryParticipantJune 25, 2016 at 10:16 pmPost count: 19
I just realized that maybe my problem is that the extruder stepper driver might not be set to the right voltage. I setup the electronics board months before the rest of the machine was ready and I may have missed that step. What is the recommended voltage for the motor that comes with the mk8?HenryParticipantJune 25, 2016 at 10:31 pmPost count: 19
I just tried a range of voltages between 0.4 and 1.0 and it still just tick tocks back and forth.HenryParticipantJune 26, 2016 at 8:21 amPost count: 19
No end stops are wired but I don’t see how that would effect the extruder motor. That should only affect the xyz axis.vicious1KeymasterJune 26, 2016 at 8:54 amPost count: 2649
Do you have the resistor plugged in or the thermistor?
There is a safe extrude temp set in the firmware that needs to be exceeded before it will move, 170C.HenryParticipantJune 26, 2016 at 1:02 pmPost count: 19
Thermistor is currently plugged in and reports expected temperatures. Attempted to extrude at 190C and I get the same result.HenryParticipantJune 26, 2016 at 1:44 pmPost count: 19
I just swapped the z and extruder stepper drivers around. The extruder now runs properly and…. to my surprise the z axis too. So I guess I have a solution. The voltages of both are about 0.6v so I’m not sure what the difference really is but I’ll take it.
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