First Layer Calibration Fails, not enough filament flows through extruder
 

First Layer Calibration Fails, not enough filament flows through extruder  

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skout
(@skout)
Active Member
I’ve recently finished assembling my i3 mk3s. When I get to the first layer calibration things do not go well at all even though it passes all the tests correctly. I have cleaned out the nozzle, disassembled it and changed the tube, tightened and loosened the gears for the extruder, cold pulled it and tried everything I have seen in the forums. Nothing seems to help. 
 
All I get is a very thin amount of filament coming through, sometimes no filament comes through even though during the initial extrusion test it came out just fine.
 
Any other ideas out there? Thanks for the help!
 
This topic was modified 1 month ago by skout
Posted : 12/09/2020 1:46 am
peter.m26
(@peter-m26)
Honorable Member

Move extruder higher up, and extrude filament, look if it is thick enough, and if it's extrudes in a straight line.

Tighten the spring of extruder?

Extrude 100mm of filament and check if the filament uses the 100mm, look for a how to on google.

You could try a new nozzle , it could be partial clogged.

Higher temperature could also help.

This post was modified 1 month ago by peter.m26
Posted : 12/09/2020 10:43 pm
skout
(@skout)
Active Member

@peter-m26

When I extruded 100 mm, it came out as 600+mm. It comes out much thinner than it goes in.

Posted : 13/09/2020 12:09 am
skout
(@skout)
Active Member

Loosened and tightened the spring with no change in result.

I performed a cold pull, and this is what it looks like...

Posted : 13/09/2020 1:04 am
Marty
(@mrschultz02)
Eminent Member
Posted by: @skout

@peter-m26

When I extruded 100 mm, it came out as 600+mm. It comes out much thinner than it goes in.

You want to check that when you extrude 100 mm, 100 mm of filament goes into the extruder.

Easy way to do it is to put a mark on the filament at something like 120mm above where it goes into the extruder, then check if it's at 20 when you extrude 100 mm.

Posted : 13/09/2020 2:43 am
skout
(@skout)
Active Member

@mrschultz02

Got it, thanks for clarifying. I did that and it worked correctly. Marked it off, moved extruder +100 and the mark moved 100.

Maybe I am just having problems with it adhering to the sheet? Not sure how much thinner the filament is supposed to come out than it goes in.

Posted : 13/09/2020 7:19 am
joan.t
(@joantabb)
Veteran Member Moderator

With the standard 0.4mm nozzle, the filament coming out is a lot thinner that the filament going in.

have you turned on 7x7 mesh bed levelling,?
Is your build plate extremely clean?  I wash mine...


are you still using the Prusa first layer calibration tool?
I find this method easier to managed...

https://forum.prusaprinters.org/forum/original-prusa-i3-mk3s-mk3-assembly-and-first-prints-troubleshooting/life-adjust-z-my-way/

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 13/09/2020 10:42 am
skout
(@skout)
Active Member

Thank you everybody for responses and help.

I greatly lowered the z axis, cleaned my steel sheet and had success.

Noob Level 1 accomplished. Fail fast they say. Thanks again!

Posted : 13/09/2020 5:45 pm
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