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Extruder Motor Overheating Prusament  

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Telep
(@telep)
Active Member
Extruder Motor Overheating Prusament

Greetings!  Hope everyone is staying safe.

I've been having a string of issues leading to other issues lately and I think I've resolved most of them(some by breaking the existing part *cough cough severed wires cough cough* and replacing it with brand new parts).  Now my issue is with the Extruder motor overheating the filament.  The Motor is well within its operating parameters, its working great as far as I can tell but well... let me post a picture and describe some things:

Alright so the attached photo (with a little doodle I used to describe the issue to my friend, let me know if its in the way) demonstrates how I pulled the filament out after it jammed a couple hours into the print.  The hobbed pulley got so hot the prusament began to wobble which gives this S pattern that will no longer fit down the PTFE tube.  I am printing at 215C, heatbed is off after the first layer so it has no influence on the motor, often I print in stealth mode, and possibly important, I'm printing with a .25mm nozzle so the overall feeding of filament is incredibly slow.  I've also replaced the PTFE tube with a brand new tube to remove that as a part of the issue and I've backed off the tension on the pullies to the minimum that prints consistently.  I do usually print in a lack enclosure but since noticing the jamming issue was above the the PTFE tube, I've been keeping the door open.

So far, I've only encountered this issue only with the pearl colored prusament but if the issue is getting worse, I do not have any other PLA atm to confirm it is now also affected so the brand of PLA may not matter.  I've almost never successfully printed with prusament so I'm inclined to think I've had this problem for a while and the prusament becomes soft before the other filaments I use.

ALSO and this one is difficult to support with facts, a month or so ago, I was having a lot of trouble with the alignment of the extruder gears.  Not in the direction of the motor shaft but in the sense that the motor was no longer parallel to the door.  The gears were increasingly unable to bite each other.  I noticed that the alignment of the part that the tensioner screw goes through on the MK3S body was no longer straight.  So I swapped it out with another copy of the part I had printed at the same time.  The Motor is once again aligned so I wonder if my motor has A) been getting quite hot for a while and B) is softening the screw holes oh so slightly in the PETG parts.  I can't rule out its just always been a badly printed part though.

Long story short, how can I get the motor to be cooler than the flexing temperature of my prusament so I can print with it?  Closing the Lack enclosure doors is preferred.  Can any wiring issues cause more resistance in the motor and cause it to heat up more?  I'm not particularly electronics savvy so I might not know what to look for.

Thanks for any help you can offer!

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Veröffentlicht : 05/04/2020 5:44 pm
Telep
(@telep)
Active Member
Themenstarter answered:
RE: Extruder Motor Overheating Prusament

And the observant of you might notice I am holding the filament the wrong way in the photo.  Here it is straight on.  Yes the tensioner was a little tight for this print.  Loosening the extruder tensioner hasn't changed the result.

 

Veröffentlicht : 05/04/2020 5:52 pm
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