Welcome! Log In Create A New Profile

Extruder motor gets hot....

prashantdshinde

Extruder motor gets hot....
October 12, 2015 03:59AM

Registered: 9 years ago
Posts: 78

Hello,

I am using a metal extruder with direct drive.

The extruder stepper motor gets hot while heating the hotend.

Did anyone noticed similar.

Setup similar to below link image.

3D-Printer-filament-Acrylic-Geeetech-I3-pro.jpg

13DD_13.jpg

Reply Quote

o_lampe

Re: Extruder motor gets hot....
October 12, 2015 04:19AM

Registered: 8 years ago
Posts: 5,232

Check the Vref of the stepper driver.
It might not match the motors max. phase current.
I have the same extruder design on my Prusa and it gets slightly warmer than the other steppers.
-Olaf

Reply Quote

prashantdshinde

Re: Extruder motor gets hot....
October 12, 2015 10:14AM

Registered: 9 years ago
Posts: 78

Hi,
It's not because of stepper driver of extruder motor. It is because of the metal contact of hotend with motor while running PID autotune. Did anyone came across such situations?

Reply Quote

o_lampe

Re: Extruder motor gets hot....
October 12, 2015 11:39AM

Registered: 8 years ago
Posts: 5,232

Does the heater block touch the heatsink/steppermount? There should be a gap of 2-3mm. ( if the hotend isn't insulated...)

Reply Quote

prashantdshinde

Re: Extruder motor gets hot....
October 12, 2015 01:37PM

Registered: 9 years ago
Posts: 78

This is my actual setup..

Reply Quote

Attachments:
open | download - Capture.PNG (570.5 KB)

o_lampe

Re: Extruder motor gets hot....
October 13, 2015 02:54AM

Registered: 8 years ago
Posts: 5,232

Just what I thought,
remove everything between heatsink and hotend. There must be no other metallic contact than by the heatbarrier.
If you have to fix the hotend to keep it from turning, you can use short cutoffs from PTFE tube and push at least two of them in the gap.
-Olaf

Reply Quote

prashantdshinde

Re: Extruder motor gets hot....
October 13, 2015 03:06AM

Registered: 9 years ago
Posts: 78

OK,
Will try today...

Reply Quote

prashantdshinde

Re: Extruder motor gets hot....
October 15, 2015 06:03AM

Registered: 9 years ago
Posts: 78

Hi,

I tried maintaining 2 - 3 mm gap between the heater block and metal extruder, but the the heating time is very much increased during PID autotune.

As the hotend barrel is directly connected to the base of metal extruder.... Anyone noticed..?