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Prusa Mini+ stops extruding after starting  

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Thomas Lynch
(@thomas-lynch)
Eminent Member
Prusa Mini+ stops extruding after starting

My MINI+ stops extruding after starting. I have taken the extruder part 3 times to get a clog out and clean out the extruder, even put a new nozzle on it .

I measured the temperature of the nozzle when it is calling for 210 Deg C, it reads 170 DegC. A calibrated thermocouple was used to read temperature. Above the nozzle it reads 210 Deg C. It starts to print after I clean it out then it drops back to 170 and nothing comes out. It reads 210 above the  nozzle though. Does something need to be replaced? 

Posted : 26/06/2022 8:09 pm
cwbullet
(@cwbullet)
RE: Prusa Mini+ stops extruding after starting

When you say you took apart the extruder do you mean the hotend or the extruder?  Are you sure the filament is dry?

--------------------
Chuck H
3D Printer Review Blog

Posted : 26/06/2022 8:13 pm
Thomas Lynch
(@thomas-lynch)
Eminent Member
Topic starter answered:
RE: Prusa Mini+ stops extruding after starting

I removed the gear that drives the filament and cleaned the teeth. I removed the nozzle and cleaned out the clog in it. I removed the nozzle so could clean out the teflon tube that runs through the hot end. All was clear every time I started  to print. But as I pointed out the nozzle temperature changed . Four times everything was clear and clean  when I started to print.

Posted : 26/06/2022 9:26 pm
Thomas Lynch
(@thomas-lynch)
Eminent Member
Topic starter answered:
RE: Prusa Mini+ stops extruding after starting

I also keep my filament in dry boxes with a humidity of between 20-30% just before use.

Posted : 26/06/2022 9:29 pm
cwbullet
(@cwbullet)
RE: Prusa Mini+ stops extruding after starting

Have you done a cold pull?  

--------------------
Chuck H
3D Printer Review Blog

Posted : 26/06/2022 9:32 pm
Thomas Lynch
(@thomas-lynch)
Eminent Member
Topic starter answered:
RE: Prusa Mini+ stops extruding after starting

I thought I did not have to, as I could see all the way through the hole in the nozzle. It was clear all the way back to the filament on the roll. Then I fed it into the printer and that is when the problem started.

Posted : 26/06/2022 10:00 pm
cwbullet
(@cwbullet)
RE:

Bits and pieces on the sides could be a cause.   Can you post an image of your first layer calibration? 

--------------------
Chuck H
3D Printer Review Blog

Posted : 26/06/2022 10:01 pm
Thomas Lynch
(@thomas-lynch)
Eminent Member
Topic starter answered:
RE: Prusa Mini+ stops extruding after starting

I went a step further yesterday. I cleaned everything and removed all old filament so I could see through the heat end without the nozzle. I also removed and cleaned out the nozzle while it was hot, no material in it. Put it all back together and tried a print. It did not work so I purged the nozzle while it was hot (215 Deg). Got a full output flow of filament.

So I tried another print (the tree frog) it worked with out any problems. I can't explain it. I will try another and see if it works.

Posted : 27/06/2022 5:42 pm
Thomas Lynch
(@thomas-lynch)
Eminent Member
Topic starter answered:
RE: Prusa Mini+ stops extruding after starting

Here is a photo  of a first layer calibration.

Posted : 28/06/2022 6:16 pm
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