Extruder Melting

[Robaire]

I'm running a Rostock Max V2 using Repetier and the extrusion motor is getting so hot it is melting the filament. Is there anything that can be done about this, perhaps machining a heatsink with fan to cool the motor?

[Tincho85]

What motors do you have? Wantai, Kysan or Automation Technology Inc?

[Tincho85]

If the label says Kysan you need to change the the motor current.

Load up your firmware, configuration.h, line 701

change:

#define MOTOR_CURRENT {175,175,175,200,0} // Values 0-255 (RAMBO 135 = ~0.75A, 185 = ~1A)

to:

#define MOTOR_CURRENT {155,155,155,165,0} // Values 0-255 (RAMBO 135 = ~0.75A, 185 = ~1A KYSAN MOTOR CURRENT SETTINGS )


http://forum.seemecnc.com/viewtopic.php ... 24&start=0

[Robaire]

I set the initial configuration for the Automation Technology Motors already. But I'll double check and re-upload the firmware.

[Robaire]

Despite re-uploading the firmware the motors are still running extremely hot.

[teoman]

Would you care to quantify extremely hot?


There are some nice fans you can install on the motor. Thingiverse has some good stls.

[Robaire]

Unfortunately I don't have a thermocouple so I can't measure exactly but it is much too hot to touch, and is hot enough to melt the PLA filament against the extruder gear. I've ordered some small 40mm x 40mm heat sinks and fans that I plan to mount to all the steppers, hopefully it will help.

[Tincho85]

Sorry but I don't want to make a thread for only this question.

I've 1.8deg Wantai motors, rated for 2.5a (42BYGHW811P2) and my settings are:
#define MOTOR_CURRENT {175,175,175,200,0} // Values 0-255 (RAMBO 135 = ~0.75A, 185 = ~1A)

175 is ok? that is 0.95a...
should I increase it? what are the pro/cons of running them at higher amps?
Btw, they are not even hot to touch when printing.

[Tincho85]

No one knows? Please, I want to keep learning

[Robaire]

Sorry I'm not familiar enough with the motor specs to provide a good answer. There are really no good sides to running at higher amps as far as I know. All that really comes from it is more heat which can only cause problems.