Prusa Mini: stops extruding, starts clicking  

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nathan.h16
(@nathan-h16)
New Member

Another problem with my Prusa Mini. I've got about 150 hours of printing in with my Mini, prusament silver PLA. I had a print suddenly fail 60+ minutes in, no filament extruding and clicking. I was able to stop, unload the filament (chewed up), reload, and purge, and restart the job, to have it fail in the same way again after about an hour of printing. Recovered again, failed again after about 30 minutes.

The failed pieces that print look fine, until printing stops.

Any ideas?

Posted : 09/02/2020 6:47 pm
Olef
 Olef
(@olef)
Honorable Member

Look here - https://forum.prusaprinters.org/forum/assembly-and-first-prints-troubleshooting/underextrusion-4/

Posted : 10/02/2020 11:15 am
Pitel
(@pitel)
Eminent Member

Just got bit by this. A second time. After a month after getting brand new hot end because I broke the first one previously. Clicking, whirring, no extrusion...

Tried manual purge (unscrew bowden tube, heat it and push the filament in by hand), everything seemed fine, means not a clogged nozzle.

Next I tried cleaning the feeder. Clean the cogs by needle, blowed with compressed air, try to mess with the spring loaded screw, still not fixed, so it's not feeder.

Ok, so hot end, my nemesis from last time... the distance between block and heatsink is around 4mm, so no problem here. Tried a couple of cold pulls, looked clean and didn't fix anything. So, unscrewed the fitting and replaced the PTFE tube. During removal of possible debris from the hot end. I pulled out what seemed like a shaving of PTFE tube. Not sure when and how it got there. Anyway, after replacing the PTFE tube and reseating the heater block, it prints again. The bad PTFE tube still had the proper length of 43,something +- 0,1 mm. the one from my first attempt was, indeed, almost a milimeter shorter.

Anyway, I begin to think the compressed PTFE tube is a design flaw of this printer. I suspect it gets used to the compression and stops being perfectly sealed after some time, and that's what's causing the trouble. I wonder what can be done with it...

Posted : 25/03/2020 2:09 pm
bobc
 bobc
(@bobc)
Reputable Member

Same here, I moved up the the heat break, but got jams again a week later. I replaced the PTFE with the spare, the one off the printer was 1 mm shorter than spec. I also suspect the PTFE can get compressed over time.

I wonder if a stainless steel insert could replace the PTFE tube? Or, a new design of heatbreak.

Posted : 25/03/2020 10:03 pm
patrik
(@patrik)
Active Member

I've got the same problem with other filaments than prusament. I've tried two different makes of PLA (One was Primacreator Easyprint). As soon as I use those, the extrusion stops after the first layer. It seems to under extrude so I tried raising the temp (didn't work), I increased the extrusion factor to 1.05 (didn't work). But as soon as I go back to the Prusament I have everything is fine!

Posted : 21/04/2020 10:08 pm
Framemanager
(@framemanager)
Honorable Member

We are not the only ones to meet this design problem ... Bondtech solved it, I changed the heatbreak (and the extruder) by this and no more problem!

Prusa I3 MK3 (THE best) - Ender 3 - Anycubic Mega S - CR-10s PRO - Prusa Mini - Clone MK3S bear à monter......
Posted : 24/04/2020 8:25 am
Olef
 Olef
(@olef)
Honorable Member

@serge-d

I've just done the same upgrades, seems to work well

Posted : 24/04/2020 9:08 am
josemart127
(@josemart127)
Active Member
Posted by: @patrik

I've got the same problem with other filaments than prusament. I've tried two different makes of PLA (One was Primacreator Easyprint). As soon as I use those, the extrusion stops after the first layer. It seems to under extrude so I tried raising the temp (didn't work), I increased the extrusion factor to 1.05 (didn't work). But as soon as I go back to the Prusament I have everything is fine!

 

This post was modified 12 months ago by josemart127
Posted : 24/04/2020 4:01 pm
cwbullet
(@cwbullet)
Illustrious Member

Have you tried cleaning filament?

--------------------
Chuck H
3D Printer Review Blog...
Posted : 24/04/2020 7:43 pm
patrik
(@patrik)
Active Member

I've tried cleaning the filament, extruder and the nozzle. I managed to print Add:north E-PLA using the Prus PLA profile and setting the first layer temp to 220, other to 215 and increasing the extrusion multiplier to 1.08. It prints but it is still underextruding!

Underextrusion

This post was modified 12 months ago by patrik
Posted : 25/04/2020 8:15 am
BeeMac
(@beemac)
Eminent Member

Yep, I noticed this problem too.  I have already done the PFTE tube replacement and things were fine for a while. Sometimes I fix it by unloading and loading the filament which I think means it's not a nozzle problem.  Sometimes I just leave the printer off for a while and that will work.

I'm thinking it's 4.0.5 since I'm also getting screen freezing during a purge at 99%, pausing and then stopping a print and unloading a filament.  Since I typical see this when the extruder problem occurs, there may be a connection.

Posted : 25/04/2020 6:56 pm
patrik
(@patrik)
Active Member

I've got it working! I noticed that the heat breaker was sticking out of the fan a bit to much. Pushed it in 5 mm and now I can print the troublesome PLAs that didn't work before. Add:North E-PLA worked with Prusa PLA profile and for an unbranded PLA I had to increase the extrusion multiplier to 1.08 and increase the temp by 5 degrees for first and other layers.

And the PTFE tube was a bit short ~0.3-0.4 mm. The replacement I got was the right length but it didn't have the chamfer at the ends so I couldn't use that.

This post was modified 12 months ago by patrik
Posted : 26/04/2020 9:32 am
patrik
(@patrik)
Active Member

I've upgraded to the Bondtech heatbreak and haven't had any problem with any of my filaments since.

Posted : 07/05/2020 3:23 pm
raymate
(@raymate)
Estimable Member

Any good STL file for a jog to cut and shape the PTFE tube, I'm really after something to shape that end.

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Prusa Mini+ (Ordered Dec 19,2020 - Arrived Feb 21,2021) stated clicking Mar 2nd / MP Select Mini V2...
Posted : 03/03/2021 4:14 pm
Steve Smith
(@steve-smith)
Trusted Member
Posted by: @raymate

Any good STL file for a jog to cut and shape the PTFE tube, I'm really after something to shape that end.

This is what I have used.
ptfe-tube-chamfer-and-cut-jig

My Mini has: A SuperPINDA + Bondtech Heatbreak + Bondtech Extruder installed...
Posted : 04/03/2021 5:54 am
raymate liked
cwbullet
(@cwbullet)
Illustrious Member

@steve-smith

I use that one and one by Karl:  

https://www.prusaprinters.org/prints/34035-ptfe-multitool

--------------------
Chuck H
3D Printer Review Blog...
Posted : 04/03/2021 10:59 am
raymate liked
Steve Smith
(@steve-smith)
Trusted Member

@cwbullet
Wow hadn't seen that one before.. I will have to check it out.

My Mini has: A SuperPINDA + Bondtech Heatbreak + Bondtech Extruder installed...
Posted : 04/03/2021 11:12 am
raymate
(@raymate)
Estimable Member

Thanks @cwbullet and @steve-smith printing both 😀 

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Prusa Mini+ (Ordered Dec 19,2020 - Arrived Feb 21,2021) stated clicking Mar 2nd / MP Select Mini V2...
Posted : 04/03/2021 1:12 pm
HU3E
 HU3E
(@hu3e)
Active Member
  1. The problem I’m having is when I load the filament in and try to print it grinds up the filament and stops printing. I can’t even get a first layer down without it grinding up. I already tried cleaning the extruder, raising the heat block, and replacing the nozzle and nothing worked.
Posted : 30/03/2021 4:40 am
Daryl
(@daryl-2)
Trusted Member

@hu3e

Have you tried cranking up the heat a bit?  I have a Mini+ that has the problem you describe but at 230C (PLA) it prints beautifully.  Also make sure the extruder tension is not too tight: with filament loaded, head of screw is roughly flush with the housing.

Posted : 30/03/2021 6:58 pm
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