Clear all

Help with diagnosing what is happening  

Terry G
New Member
Help with diagnosing what is happening


I have remained issue free till today.  I own a MK3i3 and am on using the 2nd spool of filament that I have not had issue with.  Standard 1.75mm Grey PLA.

I was approx 3 hours into a previous print and extrusion stopped. but the printer kept moving on all axis.  There was no clicking coming from the extruder.

I removed the nozzle and cleaned it out.  Loaded the same filament, proper colour and size.     I have now tried to print a different model as pictured below, Now it looks like its underextruding.  I have tried to set my Z height thinking maybe I am squishing the filament too much. I made sure the gear on the extruder motor was tight and aligned.  I have no idea what is happening? there are globs of filament that show up now on the bed and I found it clinging to the nozzle before it broke off.  Ive been at this a few hours now and can't figure out whats happening?? Any help or hints would be appreciated!

Posted : 22/01/2022 8:40 pm
Reputable Member
RE: Help with diagnosing what is happening

Sounds clogged.  Did you try a cold pull?


Prusa I3 Mk2 kit upgraded to Mk2.5s, Ender3 with many mods, Prusa Mini kit

Posted : 23/01/2022 1:11 am
Noble Member

I can't see from your picture; is there any sign of molten plastic running down the outside of your heat block from above?


Posted : 23/01/2022 2:39 pm
Eminent Member
RE: Help with diagnosing what is happening

Both @bob-2 & @diem have great suggestions. Try their Idea's first.

I just got off chat with Prusa with a similar issue. In the end was a clogged nozzle. Funny thing is it on a newer Prusa Mini.

Sometimes stuff (Filament and other stuff) plugs the hottend.

Only reason for say this is I could have saved my self hours if I had changed out the Nozzle sooner. 

Also don't forget to clean out the hobbed gears with a brush. Here is a link to Prusa's Clogged Nozzle article.

Prusa Clogged Nozzle Help Article

Good luck.

Posted : 24/01/2022 1:14 am
New Member
RE: Help with diagnosing what is happening

I don't think this belongs on the XL section guys.

Posted : 27/01/2022 1:34 am