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Prints fail, everytime.

Posted by MegaRocketPenguin 
Prints fail, everytime.
June 23, 2015 02:22PM
Working with a Makerbot rep 2 with glass build plate, and use matter control as my slicer.

No matter what temp I run at, every time I print, it fails within a centimeter of build height (z). It just stops extruding! Even when I push the filament, it won't budge (while printing) but when I pause the print, I can do the change filament command, have it act as if I am loading, and one big plush to the filament, and it extrudes again!. Until, of course, I unpause the print. It usually prints one or two layers, and stops again. That, or it doesn't do anything at all.
I have the speed set to 0.80, the feed set to 1.13.
Pictures of recent failed print, at 185. Did the same thing at 190, and 200.

Anyone have any good idea why? I have a new feed gear on the way, but I don't know if that's the issue.

Edited 2 time(s). Last edit at 06/25/2015 02:16PM by MegaRocketPenguin.
Re: Prints fail, everytoime.
June 25, 2015 12:42PM
Heat creeping up from the hotend?
(Is there a nozzle fan?)

A gap between nozzle and heat break where a plug of soft filament is forming?

Too much retraction pulling soft filament up the heat break?

Re: Prints fail, everytoime.
June 25, 2015 12:51PM
I've taken that into consideration, and I don't know.
Its one of the three: Heat creep, Software issue, Extruder issue.
Definitely no gap. I've taken it apart four times in the past four days, and each time I make sure to screw in the aluminum tube first, then screw the nozzle in,back out a few turns, screw the aluminum tube in until it hits the nozzle, then lock the heat block into a vise and tighten the nozzle in with the correct torque. Each time I take it apart, there is no trace of filament between the two.
The retraction was set at 1mm.
Someone told me to stretch the extruder spring a little, and my first successful print literally just finished.
However, this doesn't mean anything. In the past 6 days, I have had three (Counting this one) successful prints.
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