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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?

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

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

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

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

Would you care to quantify extremely hot?


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

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.

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.

No one knows? Please, I want to keep learning

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.